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Supports 15 programming languages, sorted alphabetically.

| Bash | C | C++ | C# | Go | Java | JavaScript | Kotlin |

↓WeChat reward↓ & ↓Alipay reward↓ → Reward List | 山青咏芝

Leetcode

No. Swift && Title C++ Python3 Kotlin Difficulty
1326 Minimum Number of Taps to Open to Water a Garden Hard
1325 Delete Leaves With a Given Value Medium
1324 Print Words Vertically Medium
1323 Maximum 69 Number Easy
1322 Easy
1321 Medium
1320 Minimum Distance to Type a Word Using Two Fingers Hard
1319 Number of Operations to Make Network Connected Medium
1318 Minimum Flips to Make a OR b Equal to c Medium
1317 Convert Integer to the Sum of Two No-Zero Integers Easy
1316 Distinct Echo Substrings Hard
1315 Sum of Nodes with Even-Valued Grandparent Medium
1314 Matrix Block Sum Medium
1313 Decompress Run-Length Encoded List Easy
1312 Minimum Insertion Steps to Make a String Palindrome Hard
1311 Get Watched Videos by Your Friends Medium
1310 XOR Queries of a Subarray Medium
1309 Decrypt String from Alphabet to Integer Mapping Easy
1308 Medium
1307 Verbal Arithmetic Puzzle Hard
1306 Jump Game III Medium
1305 All Elements in Two Binary Search Trees Medium
1304 Find N Unique Integers Sum up to Zero Easy
1303 Easy
1302 Deepest Leaves Sum Medium
1301 Number of Paths with Max Score Hard
1300 Sum of Mutated Array Closest to Target Medium
1299 Replace Elements with Greatest Element on Right Side Easy
1298 Maximum Candies You Can Get from Boxes Hard
1297 Maximum Number of Occurrences of a Substring Medium
1296 Divide Array in Sets of K Consecutive Numbers Medium
1295 Find Numbers with Even Number of Digits Easy
1294 Easy
1293 Shortest Path in a Grid with Obstacles Elimination Hard
1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Medium
1291 Sequential Digits Medium
1290 Convert Binary Number in a Linked List to Integer Easy
1289 Minimum Falling Path Sum II Hard
1288 Remove Covered Intervals Medium
1287 Element Appearing More Than 25% In Sorted Array Easy
1286 Iterator for Combination Medium
1285 Medium
1284 Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Hard
1283 Find the Smallest Divisor Given a Threshold Medium
1282 Group the People Given the Group Size They Belong To Medium
1281 Subtract the Product and Sum of Digits of an Integer Easy
1280 Easy
1279 Easy
1278 Palindrome Partitioning III Hard
1277 Count Square Submatrices with All Ones Medium
1276 Number of Burgers with No Waste of Ingredients Medium
1275 Find Winner on a Tic Tac Toe Game Easy
1274 Hard
1273 Medium
1272 Medium
1271 Easy
1270 Medium
1269 Number of Ways to Stay in the Same Place After Some Steps Hard
1268 Search Suggestions System Medium
1267 Count Servers that Communicate Medium
1266 Minimum Time Visiting All Points Easy
1265 Medium
1264 Medium
1263 Hard
1262 Medium
1261 Medium
1260 Easy
1259 Hard
1258 Medium
1257 Medium
1256 Medium
1255 Maximum Score Words Formed by Letters Hard
1254 Number of Closed Islands Medium
1253 Reconstruct a 2-Row Binary Matrix Medium
1252 Cells with Odd Values in a Matrix Easy
1251 Easy
1250 Check If It Is a Good Array Hard
1249 Minimum Remove to Make Valid Parentheses Medium
1248 Count Number of Nice Subarrays Medium
1247 Minimum Swaps to Make Strings Equal Medium
1246 Hard
1245 Medium
1244 Medium
1243 Easy
1242 Medium
1241 Easy
1240 Tiling a Rectangle with the Fewest Squares Hard
1239 Maximum Length of a Concatenated String with Unique Characters Medium
1238 Circular Permutation in Binary Representation Medium
1237 Find Positive Integer Solution for a Given Equation Easy
1236 Medium
1235 Maximum Profit in Job Scheduling Hard
1234 Replace the Substring for Balanced String Medium
1233 Remove Sub-Folders from the Filesystem Medium
1232 Check If It Is a Straight Line Easy
1231 Hard
1230 Medium
1229 Medium
1228 Easy
1227 Airplane Seat Assignment Probability Medium
1226 The Dining Philosophers Medium
1225 Report Contiguous Dates Hard
1224 Maximum Equal Frequency Hard
1223 Dice Roll Simulation Medium
1222 Queens That Can Attack the King Medium
1221 Split a String in Balanced Strings Easy
1220 Count Vowels Permutation Hard
1219 Path with Maximum Gold Medium
1218 Longest Arithmetic Subsequence of Given Difference Medium
1217 Play with Chips Easy
1216 Valid Palindrome III Hard
1215 Stepping Numbers Medium
1214 Two Sum BSTs Medium
1213 Intersection of Three Sorted Arrays Easy
1212 Medium
1211 Easy
1210 Minimum Moves to Reach Target with Rotations Hard
1209 Remove All Adjacent Duplicates in String II Medium
1208 Get Equal Substrings Within Budget Medium
1207 Unique Number of Occurrences Easy
1206 Hard
1205 Medium
1204 Medium
1203 Sort Items by Groups Respecting Dependencies Hard
1202 Smallest String With Swaps Medium
1201 Ugly Number III Medium
1200 Minimum Absolute Difference Easy
1199 Minimum Time To Build Blocks Hard
1198 Find Smallest Common Element in All Rows Medium
1197 Minimum Knight Moves Medium
1196 How Many Apples Can You Put into the Basket Easy
1195 Fizz Buzz Multithreaded Medium
1194 Hard
1193 Medium
1192 Critical Connections in a Network Hard
1191 K-Concatenation Maximum Sum Medium
1190 Reverse Substrings Between Each Pair of Parentheses Medium
1189 Maximum Number of Balloons Easy
1188 Medium
1187 Make Array Strictly Increasing Hard
1186 Maximum Subarray Sum with One Deletion Medium
1185 Day of the Week Easy
1184 Distance Between Bus Stops Easy
1183 Maximum Number of Ones Hard
1182 Shortest Distance to Target Color Medium
1181 Before and After Puzzle Medium
1180 Count Substrings with Only One Distinct Letter Easy
1179 Reformat Department Table Easy
1178 Number of Valid Words for Each Puzzle Hard
1177 Can Make Palindrome from Substring Medium
1176 Diet Plan Performance Easy
1175 Prime Arrangements Easy
1174 Medium
1173 Easy
1172 Dinner Plate Stacks Hard
1171 Remove Zero Sum Consecutive Nodes from Linked List Medium
1170 Compare Strings by Frequency of the Smallest Character Easy
1169 Invalid Transactions Easy
1168 Optimize Water Distribution in a Village Hard
1167 Minimum Cost to Connect Sticks Medium
1166 Design File System Medium
1165 Single-Row Keyboard Easy
1164 Medium
1163 Last Substring in Lexicographical Order Hard
1162 As Far from Land as Possible Medium
1161 Maximum Level Sum of a Binary Tree Medium
1160 Find Words That Can Be Formed by Characters Easy
1159 Hard
1158 Medium
1157 Online Majority Element In Subarray Hard
1156 Swap For Maximum Repeated Substring Medium
1155 Number of Dice Rolls With Target Sum Medium
1154 Ordinal Number Of Date Easy
1153 String Transforms Into Another String Hard
1152 Analyze User Website Visit Pattern Medium
1151 Minimum Swaps to Group All 1's Together Medium
1150 Check If a Number Is Majority Element in a Sorted Array Easy
1149 Medium
1148 Easy
1147 Longest Chunked Palindrome Decomposition Hard
1146 Snapshot Array Medium
1145 Binary Tree Coloring Game Hard
1144 Decrease Elements To Make Array Zigzag Easy
1143 Longest Common Subsequence Easy
1142 Medium
1141 Medium
1140 Stone Game II Medium
1139 Largest 1-Bordered Square Medium
1138 Alphabet Board Path Medium
1137 N-th Tribonacci Number Easy
1136 Parallel Courses Hard
1135 Connecting Cities With Minimum Cost Medium
1134 Armstrong Number Hard
1133 Largest Unique Number Easy
1132 Easy
1131 Maximum of Absolute Value Expression Medium
1130 Minimum Cost Tree From Leaf Values Medium
1129 Shortest Path with Alternating Colors Medium
1128 Number of Equivalent Domino Pairs Easy
1127 Hard
1126 Medium
1125 Smallest Sufficient Team Hard
1124 Longest Well-Performing Interval Medium
1123 Lowest Common Ancestor of Deepest Leaves Medium
1122 Relative Sort Array Easy
1121 Divide Array Into Increasing Sequences Hard
1120 Maximum Average Subtree Medium
1119 Remove Vowels from a String Easy
1118 Number of Days in a Month Easy
1117 Building H2O Hard
1116 Print Zero Even Odd Medium
1115 Print FooBar Alternately Medium
1114 Print in Order Easy
1113 Easy
1112 Medium
1111 Maximum Nesting Depth of Two Valid Parentheses Strings Medium
1110 Delete Nodes And Return Forest Medium
1109 Corporate Flight Bookings Medium
1108 Defanging an IP Address Easy
1107 Medium
1106 Parsing A Boolean Expression Hard
1105 Filling Bookcase Shelves Medium
1104 Path In Zigzag Labelled Binary Tree Easy
1103 Distribute Candies to People Easy
1102 Path With Maximum Minimum Value Medium
1101 The Earliest Moment When Everyone Become Friends Medium
1100 Find K-Length Substrings With No Repeated Characters Medium
1099 Two Sum Less Than K Easy
1098 Medium
1097 Hard
1096 Brace Expansion II Hard
1095 Find in Mountain Array Hard
1094 Car Pooling Medium
1093 Statistics from a Large Sample Medium
1092 Shortest Common Supersequence Hard
1091 Shortest Path in Binary Matrix Medium
1090 Largest Values From Labels Medium
1089 Duplicate Zeros Easy
1088 Confusing Number II Hard
1087 Permutation of Letters Medium
1086 High Five Easy
1085 Sum of Digits in the Minimum Number Easy
1084 Easy
1083 Easy
1082 Easy
1081 Smallest Subsequence of Distinct Characters Medium
1080 Insufficient Nodes in Root to Leaf Paths Medium
1079 Letter Tile Possibilities Medium
1078 Occurrences After Bigram Easy
1077 Medium
1076 Easy
1075 Easy
1074 Number of Submatrices That Sum to Target Hard
1073 Adding Two Negabinary Numbers Medium
1072 Flip Columns For Maximum Number of Equal Rows Medium
1071 Greatest Common Divisor of Strings Easy
1070 Medium
1069 Easy
1068 Easy
1067 Digit Count in Range Hard
1066 Campus Bikes II Medium
1065 Index Pairs of a String Easy
1064 Fixed Point Easy
1063 Hard
1062 Medium
1061 Medium
1060 Medium
1059 Hard
1058 Medium
1057 Medium
1056 Easy
1055 Medium
1054 Distant Barcodes Medium
1053 Previous Permutation With One Swap Medium
1052 Grumpy Bookstore Owner Medium
1051 Height Checker Easy
1050 Actors and Directors Who Cooperated At Least Three Times Easy
1049 Last Stone Weight II Medium
1048 Longest String Chain Medium
1047 Remove All Adjacent Duplicates In String Easy
1046 Last Stone Weight Easy
1045 Customers Who Bought All Products Medium
1043 Partition Array for Maximum Sum Medium
1042 Flower Planting With No Adjacent Easy
1041 Robot Bounded In Circle Easy
1040 Moving Stones Until Consecutive II Medium
1039 Minimum Score Triangulation of Polygon Medium
1038 Binary Search Tree to Greater Sum Tree Medium
1037 Valid Boomerang Easy
1036 Escape a Large Maze Hard
1035 Uncrossed Lines Medium
1034 Coloring A Border Medium
1033 Moving Stones Until Consecutive Easy
1032 Stream of Characters Hard
1031 Maximum Sum of Two Non-Overlapping Subarrays Medium
1030 Matrix Cells in Distance Order Easy
1029 Two City Scheduling Easy
1028 Recover a Tree From Preorder Traversal Hard
1027 Longest Arithmetic Sequence Medium
1026 Maximum Difference Between Node and Ancestor Medium
1025 Divisor Game Easy
1024 Video Stitching Medium
1023 Camelcase Matching Medium
1022 Sum of Root To Leaf Binary Numbers Easy
1021 Remove Outermost Parentheses Easy
1020 Number of Enclaves Medium
1019 Next Greater Node In Linked List Medium
1018 Binary Prefix Divisible By 5 Easy
1017 Convert to Base -2 Medium
1016 Binary String With Substrings Representing 1 To N Medium
1015 Smallest Integer Divisible by K Medium
1014 Best Sightseeing Pair Medium
1013 Partition Array Into Three Parts With Equal Sum Easy
1012 Numbers With 1 Repeated Digit Hard
1011 Capacity To Ship Packages Within D Days Medium
1010 Pairs of Songs With Total Durations Divisible by 60 Easy
1009 Complement of Base 10 Integer Easy
1008 Construct Binary Search Tree from Preorder Traversal Medium
1007 Minimum Domino Rotations For Equal Row Medium
1006 Clumsy Factorial Medium
1005 Maximize Sum Of Array After K Negations Easy
1004 Max Consecutive Ones III Medium
1003 Check If Word Is Valid After Substitutions Medium
1002 Find Common Characters Easy
1001 Grid Illumination Hard
1000 Minimum Cost to Merge Stones Hard
999 Available Captures for Rook Easy
998 Maximum Binary Tree II Medium
997 Find the Town Judge Easy
996 Number of Squareful Arrays Hard
995 Minimum Number of K Consecutive Bit Flips Hard
994 Rotting Oranges Easy
993 Cousins in Binary Tree Easy
992 Subarrays with K Different Integers Hard
991 Broken Calculator Medium
990 Satisfiability of Equality Equations Medium
989 Add to Array-Form of Integer Easy
988 Smallest String Starting From Leaf Medium
987 Vertical Order Traversal of a Binary Tree Medium
986 Interval List Intersections Medium
985 Sum of Even Numbers After Queries Easy
984 String Without AAA or BBB Medium
983 Minimum Cost For Tickets Medium
982 Triples with Bitwise AND Equal To Zero Hard
981 Time Based Key-Value Store Medium
980 Unique Paths III Hard
979 Distribute Coins in Binary Tree Medium
978 Longest Turbulent Subarray Medium
977 Squares of a Sorted Array Easy
976 Largest Perimeter Triangle Easy
975 Odd Even Jump Hard
974 Subarray Sums Divisible by K Medium
973 K Closest Points to Origin Medium
972 Equal Rational Numbers Hard
971 Flip Binary Tree To Match Preorder Traversal Medium
970 Powerful Integers Easy
969 Pancake Sorting Medium
968 Binary Tree Cameras Hard
967 Numbers With Same Consecutive Differences Medium
966 Vowel Spellchecker Medium
965 Univalued Binary Tree Easy
964 Least Operators to Express Number Hard
963 Minimum Area Rectangle II Medium
962 Maximum Width Ramp Medium
961 N-Repeated Element in Size 2N Array Easy
960 Delete Columns to Make Sorted III Hard
959 Regions Cut By Slashes Medium
958 Check Completeness of a Binary Tree Medium
957 Prison Cells After N Days Medium
956 Tallest Billboard Hard
955 Delete Columns to Make Sorted II Medium
954 Array of Doubled Pairs Medium
953 Verifying an Alien Dictionary Easy
952 Largest Component Size by Common Factor Hard
951 Flip Equivalent Binary Trees Medium
950 Reveal Cards In Increasing Order Medium
949 Largest Time for Given Digits Easy
948 Bag of Tokens Medium
947 Most Stones Removed with Same Row or Column Medium
946 Validate Stack Sequences Medium
945 Minimum Increment to Make Array Unique Medium
944 Delete Columns to Make Sorted Easy
943 Find the Shortest Superstring Hard
942 DI String Match Easy
941 Valid Mountain Array Easy
940 Distinct Subsequences II Hard
939 Minimum Area Rectangle Medium
938 Range Sum of BST Medium
937 Reorder Log Files Easy
936 Stamping The Sequence Hard
935 Knight Dialer Medium
934 Shortest Bridge Medium
933 Number of Recent Calls Easy
932 Beautiful Array Medium
931 Minimum Falling Path Sum Medium
930 Binary Subarrays With Sum Medium
929 Unique Email Addresses Easy
928 Minimize Malware Spread II Hard
927 Three Equal Parts Hard
926 Flip String to Monotone Increasing Medium
925 Long Pressed Name Easy
924 Minimize Malware Spread Hard
923 3Sum With Multiplicity Medium
922 Sort Array By Parity II Easy
921 Minimum Add to Make Parentheses Valid Medium
920 Number of Music Playlists Hard
919 Complete Binary Tree Inserter Medium
918 Maximum Sum Circular Subarray Medium
917 Reverse Only Letters Easy
916 Word Subsets Medium
915 Partition Array into Disjoint Intervals Medium
914 X of a Kind in a Deck of Cards Easy
913 Cat and Mouse Hard
912 Sort an Array Medium
911 Online Election Medium
910 Smallest Range II Medium
909 Snakes and Ladders Medium
908 Smallest Range I Easy
907 Sum of Subarray Minimums Medium
906 Super Palindromes Hard
905 Sort Array By Parity Easy
904 Fruit Into Baskets Medium
903 Valid Permutations for DI Sequence Hard
902 Numbers At Most N Given Digit Set Hard
901 Online Stock Span Medium
900 RLE Iterator Medium
899 Orderly Queue Hard
898 Bitwise ORs of Subarrays Medium
897 Increasing Order Search Tree Easy
896 Monotonic Array Easy
895 Maximum Frequency Stack Hard
894 All Possible Full Binary Trees Medium
893 Groups of Special-Equivalent Strings Easy
892 Surface Area of 3D Shapes Easy
891 Sum of Subsequence Widths Hard
890 Find and Replace Pattern Medium
889 Construct Binary Tree from Preorder and Postorder Traversal Medium
888 Fair Candy Swap Easy
887 Super Egg Drop Hard
886 Possible Bipartition Medium
885 Spiral Matrix III Medium
884 Uncommon Words from Two Sentences Easy
883 Projection Area of 3D Shapes Easy
882 Reachable Nodes In Subdivided Graph Hard
881 Boats to Save People Medium
880 Decoded String at Index Medium
879 Profitable Schemes Hard
878 Nth Magical Number Hard
877 Stone Game Medium
876 Middle of the Linked List Easy
875 Koko Eating Bananas Medium
874 Walking Robot Simulation Easy
873 Length of Longest Fibonacci Subsequence Medium
872 Leaf-Similar Trees Easy
871 Minimum Number of Refueling Stops Hard
870 Advantage Shuffle Medium
869 Reordered Power of 2 Medium
868 Binary Gap Easy
867 Transpose Matrix Easy
866 Prime Palindrome Medium
865 Smallest Subtree with all the Deepest Nodes Medium
864 Shortest Path to Get All Keys Hard
863 All Nodes Distance K in Binary Tree Medium
862 Shortest Subarray with Sum at Least K Hard
861 Score After Flipping Matrix Medium
860 Lemonade Change Easy
859 Buddy Strings Easy
858 Mirror Reflection Medium
857 Minimum Cost to Hire K Workers Hard
856 Score of Parentheses Medium
855 Exam Room Medium
854 K-Similar Strings Hard
853 Car Fleet Medium
852 Peak Index in a Mountain Array Easy
851 Loud and Rich Medium
850 Rectangle Area II Hard
849 Maximize Distance to Closest Person Easy
848 Shifting Letters Medium
847 Shortest Path Visiting All Nodes Hard
846 Hand of Straights Medium
845 Longest Mountain in Array Medium
844 Backspace String Compare Easy
843 Guess the Word Hard
842 Split Array into Fibonacci Sequence Medium
841 Keys and Rooms Medium
840 Magic Squares In Grid Easy
839 Similar String Groups Hard
838 Push Dominoes Medium
837 New 21 Game Medium
836 Rectangle Overlap Easy
835 Image Overlap Medium
834 Sum of Distances in Tree Hard
833 Find And Replace in String Medium
832 Flipping an Image Easy
831 Masking Personal Information Medium
830 Positions of Large Groups Easy
829 Consecutive Numbers Sum Hard
828 Unique Letter String Hard
827 Making A Large Island Hard
826 Most Profit Assigning Work Medium
825 Friends Of Appropriate Ages Medium
824 Goat Latin Easy
823 Binary Trees With Factors Medium
822 Card Flipping Game Medium
821 Shortest Distance to a Character Easy
820 Short Encoding of Words Medium
819 Most Common Word Easy
818 Race Car Hard
817 Linked List Components Medium
816 Ambiguous Coordinates Medium
815 Bus Routes Hard
814 Binary Tree Pruning Medium
813 Largest Sum of Averages Medium
812 Largest Triangle Area Easy
811 Subdomain Visit Count Easy
810 Chalkboard XOR Game Hard
809 Expressive Words Medium
808 Soup Servings Medium
807 Max Increase to Keep City Skyline Medium
806 Number of Lines To Write String Easy
805 Split Array With Same Average Hard
804 Unique Morse Code Words Easy
803 Bricks Falling When Hit Hard
802 Find Eventual Safe States Medium
801 Minimum Swaps To Make Sequences Increasing Medium
800 Easy
799 Champagne Tower Medium
798 Smallest Rotation with Highest Score Hard
797 All Paths From Source to Target Medium
796 Rotate String Easy
795 Number of Subarrays with Bounded Maximum Medium
794 Valid Tic-Tac-Toe State Medium
793 Preimage Size of Factorial Zeroes Function Hard
792 Number of Matching Subsequences Medium
791 Custom Sort String Medium
790 Domino and Tromino Tiling Medium
789 Escape The Ghosts Medium
788 Rotated Digits Easy
787 Cheapest Flights Within K Stops Medium
786 K-th Smallest Prime Fraction Hard
785 Is Graph Bipartite? Medium
784 Letter Case Permutation Easy
783 Minimum Distance Between BST Nodes Easy
782 Transform to Chessboard Hard
781 Rabbits in Forest Medium
780 Reaching Points Hard
779 K-th Symbol in Grammar Medium
778 Swim in Rising Water Hard
777 Swap Adjacent in LR String Medium
776 Medium
775 Global and Local Inversions Medium
774 Hard
773 Sliding Puzzle Hard
772 Hard
771 Jewels and Stones Easy
770 Basic Calculator IV Hard
769 Max Chunks To Make Sorted Medium
768 Max Chunks To Make Sorted II Hard
767 Reorganize String Medium
766 Toeplitz Matrix Easy
765 Couples Holding Hands Hard
764 Largest Plus Sign Medium
763 Partition Labels Medium
762 Prime Number of Set Bits in Binary Representation Easy
761 Special Binary String Hard
760 Easy
759 Hard
758 Easy
757 Set Intersection Size At Least Two Hard
756 Pyramid Transition Matrix Medium
755 Medium
754 Reach a Number Easy
753 Cracking the Safe Hard
752 Open the Lock Medium
751 Easy
750 Medium
749 Contain Virus Hard
748 Shortest Completing Word Easy
747 Largest Number At Least Twice of Others Easy
746 Min Cost Climbing Stairs Easy
745 Prefix and Suffix Search Hard
744 Find Smallest Letter Greater Than Target Easy
743 Network Delay Time Medium
742 Medium
741 Cherry Pickup Hard
740 Delete and Earn Medium
739 Daily Temperatures Medium
738 Monotone Increasing Digits Medium
737 Medium
736 Parse Lisp Expression Medium
735 Asteroid Collision Medium
734 Easy
733 Flood Fill Easy
732 My Calendar III Hard
731 My Calendar II Medium
730 Count Different Palindromic Subsequences Hard
729 My Calendar I Medium
728 Self Dividing Numbers Easy
727 Hard
726 Number of Atoms Hard
725 Split Linked List in Parts Medium
724 Find Pivot Index Easy
723 Medium
722 Remove Comments Medium
721 Accounts Merge Medium
720 Longest Word in Dictionary Easy
719 Find K-th Smallest Pair Distance Hard
718 Maximum Length of Repeated Subarray Medium
717 Easy
716 Easy
715 Range Module Hard
714 Best Time to Buy and Sell Stock with Transaction Fee Medium
713 Subarray Product Less Than K Medium
712 Minimum ASCII Delete Sum for Two Strings Medium
711 Hard
710 Random Pick with Blacklist Hard
709 To Lower Case Easy
708 Medium
707 Design Linked List Easy
706 Design HashMap Easy
705 Design HashSet Easy
704 Binary Search Easy
703 Kth Largest Element in a Stream Easy
702 Medium
701 Insert into a Binary Search Tree Medium
700 Search in a Binary Search Tree Easy
699 Falling Squares Hard
698 Partition to K Equal Sum Subsets Medium
697 Degree of an Array Easy
696 Count Binary Substrings Easy
695 Max Area of Island Medium
694 Medium
693 Binary Number with Alternating Bits Easy
692 Top K Frequent Words Medium
691 Stickers to Spell Word Hard
690 Employee Importance Easy
689 Maximum Sum of 3 Non-Overlapping Subarrays Hard
688 Knight Probability in Chessboard Medium
687 Longest Univalue Path Easy
686 Repeated String Match Easy
685 Redundant Connection II Hard
684 Redundant Connection Medium
683 Hard
682 Baseball Game Easy
681 Medium
680 Valid Palindrome II Easy
679 24 Game Medium
678 Valid Parenthesis String Medium
677 Map Sum Pairs Medium
676 Implement Magic Dictionary Medium
675 Cut Off Trees for Golf Event Hard
674 Longest Continuous Increasing Subsequence Easy
673 Number of Longest Increasing Subsequence Medium
672 Bulb Switcher II Medium
671 Second Minimum Node In a Binary Tree Easy
670 Maximum Swap Medium
669 Trim a Binary Search Tree Easy
668 Kth Smallest Number in Multiplication Table Hard
667 Beautiful Arrangement II Medium
666 Medium
665 Non-decreasing Array Medium
664 Strange Printer Medium
663 Medium
662 Maximum Width of Binary Tree Medium
661 Image Smoother Easy
660 Hard
659 Split Array into Consecutive Subsequences Medium
658 Find K Closest Elements Medium
657 Robot Return to Origin Easy
656 Hard
655 Print Binary Tree Medium
654 Maximum Binary Tree Medium
653 Two Sum IV - Input is a BST Easy
652 Find Duplicate Subtrees Medium
651 Medium
650 2 Keys Keyboard Medium
649 Dota2 Senate Medium
648 Replace Words Medium
647 Palindromic Substrings Medium
646 Maximum Length of Pair Chain Medium
645 Set Mismatch Easy
644 Hard
643 Maximum Average Subarray I Easy
642 Hard
641 Design Circular Deque Medium
640 Solve the Equation Medium
639 Decode Ways II Hard
638 Shopping Offers Medium
637 Average of Levels in Binary Tree Easy
636 Exclusive Time of Functions Medium
635 Medium
634 Medium
633 Sum of Square Numbers Easy
632 Smallest Range Hard
631 Hard
630 Course Schedule III Hard
629 K Inverse Pairs Array Hard
628 Maximum Product of Three Numbers Easy
627 Swap Salary Easy
626 Exchange Seats Medium
625 Medium
624 Easy
623 Add One Row to Tree Medium
622 Design Circular Queue Medium
621 Task Scheduler Medium
620 Not Boring Movies Easy
619 Easy
618 Hard
617 Merge Two Binary Trees Easy
616 Medium
615 Hard
614 Medium
613 Easy
612 Medium
611 Valid Triangle Number Medium
610 Easy
609 Find Duplicate File in System Medium
608 Medium
607 Easy
606 Construct String from Binary Tree Easy
605 Can Place Flowers Easy
604 Easy
603 Easy
602 Medium
601 Human Traffic of Stadium Hard
600 Non-negative Integers without Consecutive Ones Hard
599 Minimum Index Sum of Two Lists Easy
598 Range Addition II Easy
597 Easy
596 Classes More Than 5 Students Easy
595 Big Countries Easy
594 Longest Harmonious Subsequence Easy
593 Valid Square Medium
592 Fraction Addition and Subtraction Medium
591 Tag Validator Hard
590 Easy
589 Easy
588 Hard
587 Erect the Fence Hard
586 Easy
585 Medium
584 Easy
583 Delete Operation for Two Strings Medium
582 Medium
581 Shortest Unsorted Continuous Subarray  Easy
580 Medium
579 Hard
578 Medium
577 Employee Bonus Easy
576 Out of Boundary Paths Medium
575 Distribute Candies Easy
574 Medium
573 Medium
572 Subtree of Another Tree Easy
571 Hard
570 Medium
569 Hard
568 Hard
567 Permutation in String Medium
566 Reshape the Matrix Easy
565 Array Nesting Medium
564 Find the Closest Palindrome Hard
563 Binary Tree Tilt Easy
562 Medium
561 Array Partition I Easy
560 Subarray Sum Equals K Medium
559 Easy
558 Easy
557 Reverse Words in a String III Easy
556 Next Greater Element III Medium
555 Medium
554 Brick Wall Medium
553 Optimal Division Medium
552 Student Attendance Record II Hard
551 Student Attendance Record I Easy
550 Medium
549 Medium
548 Medium
547 Friend Circles Medium
546 Remove Boxes Hard
545 Medium
544 Medium
543 Diameter of Binary Tree Easy
542 01 Matrix Medium
541 Reverse String II Easy
540 Single Element in a Sorted Array Medium
539 Minimum Time Difference Medium
538 Convert BST to Greater Tree Easy
537 Complex Number Multiplication Medium
536 Medium
535 Medium
534 Medium
533 Medium
532 K-diff Pairs in an Array Easy
531 Medium
530 Minimum Absolute Difference in BST Easy
529 Minesweeper Medium
528 Random Pick with Weight Medium
527 Hard
526 Beautiful Arrangement Medium
525 Contiguous Array Medium
524 Longest Word in Dictionary through Deleting Medium
523 Continuous Subarray Sum Medium
522 Longest Uncommon Subsequence II Medium
521 Longest Uncommon Subsequence I Easy
520 Detect Capital Easy
519 Random Flip Matrix Medium
518 Coin Change 2 Medium
517 Super Washing Machines Hard
516 Longest Palindromic  Medium
515 Find Largest Value in Each Tree Row Medium
514 Freedom Trail Hard
513 Find Bottom Left Tree Value Medium
512 Medium
511 Medium
510 Medium
509 Fibonacci Number Easy
508 Most Frequent Subtree Sum Medium
507 Perfect Number Easy
506 Relative Ranks Easy
505 Medium
504 Base 7 Easy
503 Next Greater Element II Medium
502 Initial Public Offerings Hard
501 Find Mode in Binary Search Tree Easy
500 Keyboard Row Easy
499 Hard
498 Diagonal Traverse Medium
497 [Random Point in Non Medium
496 Next Greater Element I Easy
495 Teemo Attacking Medium
494 Target Sum Medium
493 Reverse Pairs Hard
492 Construct the Rectangle Easy
491 Increasing Subsequences Medium
490 Medium
489 Hard
488 Zuma Game Hard
487 Medium
486 Predict the Winner Medium
485 Max Consecutive Ones Easy
484 Medium
483 Smallest Good Base Hard
482 License Key Formatting Easy
481 Magical String Medium
480 Sliding Window Median Hard
479 Largest Palindrome Product Hard
478 Generate Random Point in a Circle Medium
477 Total Hamming Distance Medium
476 Number Complement Easy
475 Heaters Easy
474 Ones and Zeroes Medium
473 Matchsticks to Square Medium
472 Concatenated Words Hard
471 Hard
470 Implement Rand10() Using Rand7() Medium
469 Medium
468 Validate IP Address Medium
467 Unique Substrings in Wraparound String Medium
466 Count The Repetitions Hard
465 Hard
464 Can I Win Medium
463 Island Perimeter Easy
462 Minimum Moves to Equal Array Elements II Medium
461 Hamming Distance Easy
460 LFU Cache Hard
459 Repeated Substring Pattern Easy
458 Poor Pigs Hard
457 Circular Array Loop Medium
456 132 Pattern Medium
455 Assign Cookies Easy
454 4Sum II Medium
453 Minimum Moves to Equal Array Elements Easy
452 Minimum Number of Arrows to Burst Balloons Medium
451 Sort Characters By Frequency Medium
450 Delete Node in a BST Medium
449 Medium
448 Find All Numbers Disappeared in an Array Easy
447 Number of Boomerangs Easy
446 Arithmetic Slices II - Subsequence Hard
445 Add Two Numbers II Medium
444 Medium
443 String Compression Easy
442 Find All Duplicates in an Array Medium
441 Arranging Coins Easy
440 K-th Smallest in Lexicographical Order Hard
439 Medium
438 Find All Anagrams in a String Easy
437 Path Sum III Easy
436 Find Right Interval Medium
435 Non-overlapping Intervals Medium
434 Number of Segments in a String Easy
433 Minimum Genetic Mutation Medium
432 All O`one Data Structure Hard
431 Hard
430 Medium
429 Easy
428 Hard
427 Easy
426 Medium
425 Hard
424 Longest Repeating Character Replacement Medium
423 Reconstruct Original Digits from English Medium
422 Easy
421 Maximum XOR of Two Numbers in an Array Medium
420 Strong Password Checker Hard
419 Battleships in a Board Medium
418 Medium
417 Pacific Atlantic Water Flow Medium
416 Partition Equal Subset Sum Medium
415 Add Strings Easy
414 Third Maximum Number Easy
413 Arithmetic Slices Medium
412 Fizz Buzz Easy
411 Hard
410 Split Array Largest Sum Hard
409 Longest Palindrome Easy
408 Easy
407 Trapping Rain Water II Hard
406 Queue Reconstruction by Height Medium
405 Convert a Number to Hexadecimal Easy
404 Sum of Left Leaves Easy
403 Frog Jump Hard
402 Remove K Digits Medium
401 Binary Watch Easy
400 Nth Digit  Easy
399 Evaluate Division Medium
398 Random Pick Index Medium
397 Integer Replacement Medium
396 Rotate Function Medium
395 Longest Substring with At Least K Repeating Characters Medium
394 Decode String Medium
393 UTF-8 Validation Medium
392 Is Subsequence Medium
391 Perfect Rectangle Hard
390 Elimination Game Medium
389 Find the Difference  Easy
388 Longest Absolute File Path Medium
387 First Unique Character in a String Easy
386 Lexicographical Numbers Medium
385 Mini Parser Medium
384 Shuffle an Array Medium
383 Ransom Note Easy
382 Linked List Random Node Medium
381 Insert Delete GetRandom O(1) - Duplicates allowed Hard
380 Insert Delete GetRandom O(1) Medium
379 Medium
378 Kth Smallest Element in a Sorted Matrix Medium
377 Combination Sum IV Medium
376 Wiggle Subsequence Medium
375 Guess Number Higher or Lower II Medium
374 Guess Number Higher or Lower Easy
373 Find K Pairs with Smallest Sums Medium
372 Super Pow Medium
371 Sum of Two Integers  Easy
370 Medium
369 Medium
368 Largest Divisible Subset Medium
367 Valid Perfect Square Easy
366 Medium
365 Water and Jug Problem Medium
364 Medium
363 Max Sum of Rectangle No Larger Than K Hard
362 Medium
361 Medium
360 Medium
359 Easy
358 Hard
357 Count Numbers with Unique Digits Medium
356 Medium
355 Medium
354 Russian Doll Envelopes Hard
353 Medium
352 Data Stream as Disjoint Intervals Hard
351 Android Unlock Patterns $ Medium
350 Intersection of Two Arrays II Easy
349 Intersection of Two Arrays Easy
348 Design Tic-Tac-Toe $ Medium
347 Top K Frequent Elements Medium
346 Moving Average from Data Stream $ Easy
345 Reverse Vowels of a String Easy
344 Reverse String Easy
343 Integer Break Medium
342 Power of Four Easy
341 Flatten Nested List Iterator Medium
340 Longest Substring with At Most K Distinct Characters $ Hard
339 Nested List Weight Sum $ Easy
338 Counting Bits Medium
337 House Robber III Medium
336 Palindrome Pairs Hard
335 Self Crossing Hard
334 Increasing Triplet Subsequence Medium
333 Largest BST Subtree $ Medium
332 Reconstruct Itinerary Medium
331 Verify Preorder Serialization of a Binary Tree Medium
330 Patching Array Hard
329 Longest Increasing Path in a Matrix Hard
328 Odd Even Linked List Medium
327 Count of Range Sum Hard
326 Power of Three Easy
325 Maximum Size Subarray Sum Equals k $ Medium
324 Wiggle Sort II Medium
323 Number of Connected Components in an Undirected Graph $ Medium
322 Coin Change Medium
321 Create Maximum Number Hard
320 Generalized Abbreviation $ Medium
319 Bulb Switcher Medium
318 Maximum Product of Word Lengths Medium
317 Shortest Distance from All Buildings $ Hard
316 Remove Duplicate Letters Hard
315 Count of Smaller Numbers After Self Hard
314 Binary Tree Vertical Order Traversal $ Medium
313 Super Ugly Number Medium
312 Burst Balloons Hard
311 Sparse Matrix Multiplication $ Medium
310 Minimum Height Trees Medium
309 Best Time to Buy and Sell Stock with Cooldown Medium
308 Range Sum Query 2D - Mutable Hard
307 Range Sum Query - Mutable Medium
306 Additive Number Medium
305 Number of Islands II $ Hard
304 Range Sum Query 2D - Immutable Medium
303 Range Sum Query - Immutable Easy
302 Smallest Rectangle Enclosing Black Pixels $ Hard
301 Remove Invalid Parentheses Hard
300 Longest Increasing Subsequence Medium
299 Bulls and Cows Medium
298 Binary Tree Longest Consecutive Sequence $ Medium
297 Serialize and Deserialize Binary Tree Hard
296 Best Meeting Point $ Hard
295 Find Median from Data Stream Hard
294 Flip Game II $ Medium
293 Flip Game $ Easy
292 Nim Game Easy
291 Word Pattern II $ Hard
290 Word Pattern  Easy
289 Game of Life Medium
288 Unique Word Abbreviation $ Medium
287 Find the Duplicate Number Medium
286 Walls and Gates $ Medium
285 Inorder Successor in BST $ Medium
284 Peeking Iterator Medium
283 Move Zeroes Easy
282 Expression Add Operators Hard
281 Zigzag Iterator $ Medium
280 Wiggle Sort Medium
279 Perfect Squares Medium
278 First Bad Version Easy
277 Find the Celebrity $ Medium
276 Paint Fence $ Easy
275 H-Index II Medium
274 H-Index Medium
273 Integer to English Words Hard
272 Closest Binary Search Tree Value II $ Hard
271 Encode and Decode Strings $ Medium
270 Closest Binary Search Tree Value $ Easy
269 Alien Dictionary $ Hard
268 Missing Number Easy
267 Palindrome Permutation II $ Medium
266 Palindrome Permutation $ Easy
265 Paint House II $ Hard
264 Ugly Number II Medium
263 Ugly Number Easy
262 Trips and Users Hard
261 Graph Valid Tree $ Medium
260 Single Number III Medium
259 3Sum Smaller $ Medium
258 Add Digits Easy
257 Binary Tree Paths Easy
256 Paint House $ Easy
255 Verify Preorder Sequence in Binary Search Tree $ Medium
254 Factor Combinations $ Medium
253 Meeting Rooms II $ Medium
252 Meeting Rooms $ Easy
251 Flatten 2D Vector $ Medium
250 Count Univalue Subtrees $ Medium
249 Group Shifted Strings $ Medium
248 Strobogrammatic Number III $ Hard
247 Strobogrammatic Number II $ Medium
246 Strobogrammatic Number $ Easy
245 Shortest Word Distance III $ Medium
244 Shortest Word Distance II $ Medium
243 Shortest Word Distance $ Easy
242 Valid Anagram Easy
241 Different Ways to Add Parentheses Medium
240 Search a 2D Matrix II Medium
239 Sliding Window Maximum Hard
238 Product of Array Except Self Medium
237 Delete Node in a Linked List Easy
236 Lowest Common Ancestor of a Binary Tree Medium
235 Lowest Common Ancestor of a Binary Search Tree Easy
234 Palindrome Linked List Easy
233 Number of Digit One Hard
232 Implement Queue using Stacks Easy
231 Power of Two Easy
230 Kth Smallest Element in a BST Medium
229 Majority Element II Medium
228 Summary Ranges Medium
227 Basic Calculator II Medium
226 Invert Binary Tree Easy
225 Implement Stack using Queues Easy
224 Basic Calculator Hard
223 Rectangle Area Medium
222 Count Complete Tree Nodes Medium
221 Maximal Square Medium
220 Contains Duplicate III Medium
219 Contains Duplicate II Easy
218 The Skyline Problem Hard
217 Contains Duplicate Easy
216 Combination Sum III Medium
215 Kth Largest Element in an Array Medium
214 Shortest Palindrome Hard
213 House Robber II Medium
212 Word Search II Hard
211 Add and Search Word - Data structure design Medium
210 Course Schedule II Medium
209 Minimum Size Subarray Sum Medium
208 Implement Trie (Prefix Tree) Medium
207 Course Schedule Medium
206 Reverse Linked List Easy
205 Isomorphic Strings Easy
204 Count Primes Easy
203 Remove Linked List Elements Easy
202 Happy Number Easy
201 Bitwise AND of Numbers Range Medium
200 Number of Islands Medium
199 Binary Tree Right Side View Medium
198 House Robber Easy
197 Rising Temperature Easy
196 Delete Duplicate Emails Easy
195 Tenth Line Easy
194 Transpose File Medium
193 Valid Phone Numbers Easy
192 Word Frequency  Medium
191 Number of 1 Bits Easy
190 Reverse Bits Easy
189 Rotate Array Easy
188 Best Time to Buy and Sell Stock IV Hard
187 Repeated DNA Sequences Medium
186 Reverse Words in a String II $ Medium
185 Department Top Three Salaries Hard
184 Department Highest Salary Medium
183 Customers Who Never Order Easy
182 Duplicate Emails Easy
181 Employees Earning More Than Their Managers Easy
180 Consecutive Numbers Medium
179 Largest Number Medium
178 Rank Scores Medium
177 Nth Highest Salary  Medium
176 Second Highest Salary Easy
175 Combine Two Tables Easy
174 Dungeon Game Hard
173 Binary Search Tree Iterator Medium
172 Factorial Trailing Zeroes Easy
171 Excel Sheet Column Number Easy
170 Two Sum III - Data structure design $ Easy
169 Majority Element Easy
168 Excel Sheet Column Title Easy
167 Two Sum II - Input array is sorted Easy
166 Fraction to Recurring Decimal Medium
165 Compare Version Numbers Medium
164 Maximum Gap Hard
163 Missing Ranges $ Medium
162 Find Peak Element Medium
161 One Edit Distance $ Medium
160 Intersection of Two Linked Lists Easy
159 Longest Substring with At Most Two Distinct Characters $ Hard
158 Read N Characters Given Read4 II $ Hard
157 Read N Characters Given Read4 $ Easy
156 Binary Tree Upside Down $ Medium
155 Min Stack  Easy
154 Find Minimum in Rotated Sorted Array II Hard
153 Find Minimum in Rotated Sorted Array Medium
152 Maximum Product Subarray Medium
151 Reverse Words in a String Medium
150 Evaluate Reverse Polish Notation Medium
149 Max Points on a Line Hard
148 Sort List Medium
147 Insertion Sort List Medium
146 LRU Cache Hard
145 Binary Tree Postorder Traversal Hard
144 Binary Tree Preorder Traversal Medium
143 Reorder List Medium
142 Linked List Cycle II Medium
141 Linked List Cycle Easy
140 Word Break II Hard
139 Word Break Medium
138 Copy List with Random Pointer Medium
137 Single Number II Medium
136 Single Number Easy
135 Candy Hard
134 Gas Station Medium
133 Clone Graph Medium
132 Palindrome Partitioning II Hard
131 Palindrome Partitioning Medium
130 Surrounded Regions Medium
129 Sum Root to Leaf Numbers Medium
128 Longest Consecutive Sequence Hard
127 Word Ladder Medium
126 Word Ladder II Hard
125 Valid Palindrome Easy
124 Binary Tree Maximum Path Sum Hard
123 Best Time to Buy and Sell Stock III Hard
122 Best Time to Buy and Sell Stock II Easy
121 Best Time to Buy and Sell Stock Easy
120 Triangle Medium
119 Pascal's Triangle II Easy
118 Pascal's Triangle Easy
117 Populating Next Right Pointers in Each Node II  Medium
116 Populating Next Right Pointers in Each Node Medium
115 Distinct Subsequences Hard
114 Flatten Binary Tree to Linked List Medium
113 Path Sum II Medium
112 Path Sum Easy
111 Minimum Depth of Binary Tree Easy
110 Balanced Binary Tree Easy
109 Convert Sorted List to Binary Search Tree Medium
108 Convert Sorted Array to Binary Search Tree Easy
107 Binary Tree Level Order Traversal II Easy
106 Construct Binary Tree from Inorder and Postorder Traversal Medium
105 Construct Binary Tree from Preorder and Inorder Traversal Medium
104 Maximum Depth of Binary Tree Easy
103 Binary Tree Zigzag Level Order Traversal Medium
102 Binary Tree Level Order Traversal Medium
101 Symmetric Tree Easy
100 Same Tree Hard
99 Recover Binary Search Tree Medium
98 Validate Binary Search Tree Medium
97 Interleaving String Medium
96 Unique Binary Search Trees Medium
95 Unique Binary Search Trees II Medium
94 Binary Tree Inorder Traversal Medium
93 Restore IP Addresses Medium
92 Reverse Linked List II Medium
91 Decode Ways Medium
90 Subsets II Medium
89 Gray Code Medium
88 Merge Sorted Array Easy
87 Scramble String Hard
86 Partition List Medium
85 Maximal Rectangle Hard
84 Largest Rectangle in Histogram Hard
83 Remove Duplicates from Sorted List Easy
82 Remove Duplicates from Sorted List II Medium
81 Search in Rotated Sorted Array II Medium
80 Remove Duplicates from Sorted Array II Medium
79 Word Search Medium
78 Subsets Medium
77 Combinations  Medium
76 Minimum Window Substring Hard
75 Sort Colors Medium
74 Search a 2D Matrix Medium
73 Set Matrix Zeroes Medium
72 Edit Distance Hard
71 Simplify Path Medium
70 Climbing Stairs Easy
69 Sqrt(x) Easy
68 Text Justification Hard
67 Add Binary Easy
66 Plus One Easy
65 Valid Number Hard
64 Minimum Path Sum Medium
63 Unique Paths II Medium
62 Unique Paths Medium
61 Rotate List Medium
60 Permutation Sequence Medium
59 Spiral Matrix II Medium
58 Length of Last Word Easy
57 Insert Interval Hard
56 Merge Intervals Medium
55 Jump Game Medium
54 Spiral Matrix Medium
53 Maximum Subarray Easy
52 N-Queens II Hard
51 N-Queens Hard
50 Pow(x, n) Medium
49 Group Anagrams Medium
48 Rotate Image Medium
47 Permutations II Medium
46 Permutations Medium
45 Jump Game II Hard
44 Wildcard Matching Hard
43 Multiply Strings Medium
42 Trapping Rain Water Hard
41 First Missing Positive Hard
40 Combination Sum II Medium
39 Combination Sum Medium
38 Count and Say Easy
37 Sudoku Solver Hard
36 Valid Sudoku Medium
35 Search Insert Position Easy
34 Find First and Last Position of Element in Sorted Array Medium
33 Search in Rotated Sorted Array Medium
32 Longest Valid Parentheses Hard
31 Next Permutation Medium
30 Substring with Concatenation of All Words Hard
29 Divide Two Integers Medium
28 Implement strStr()  Easy
27 Remove Element  Easy
26 Remove Duplicates from Sorted Array Easy
25 Reverse Nodes in k-Group Hard
24 Swap Nodes in Pairs Medium
23 Merge k Sorted Lists Hard
22 Generate Parentheses Medium 
21 Merge Two Sorted Lists Easy
20 Valid Parentheses Easy
19 Remove Nth Node From End of List Medium
18 4Sum Medium
17 Letter Combinations of a Phone Number Medium
16 3Sum Closest Medium
15 3Sum Medium
14 Longest Common Prefix Easy
13 Roman to Integer Easy
12 Integer to Roman Medium
11 Container With Most Water Medium
10 Regular Expression Matching Hard
9 Palindrome Number Easy
8 String to Integer (atoi) Medium
7 Reverse Integer Easy
6 ZigZag Conversion Medium
5 Longest Palindromic Substring Medium
4 Median of Two Sorted Arrays Hard
3 Longest Substring Without Repeating Characters Medium
2 Add Two Numbers Medium
1 Two Sum Easy

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