| 1774 |
Closest Dessert Cost |
Python3 |
Medium |
Greedy |
| 1773 |
Count Items Matching a Rule |
Python3 |
Easy |
Array, String |
| 1758 |
Minimum Changes To Make Alternating Binary String |
Python3 |
Easy |
Greedy, Array |
| 1752 |
Check if Array Is Sorted and Rotated |
Python3 |
Easy |
Array |
| 1748 |
Sum of Unique Elements |
Python3 |
Easy |
Array, Hash Table |
| 1742 |
Maximum Number of Balls in a Box |
Python3 |
Easy |
Array |
| 1736 |
Latest Time by Replacing Hidden Digits |
Python3 |
Easy |
Greedy, String |
| 1732 |
Find the Highest Altitude |
Python3 |
Easy |
Array |
| 1725 |
Number Of Rectangles That Can Form The Largest Square |
Python3 |
Easy |
Greedy |
| 1720 |
Decode XORed Array |
Python3 |
Easy |
Bit Manipulation |
| 1716 |
Calculate Money in Leetcode Bank |
Python3 |
Easy |
Greedy, Math |
| 1710 |
Maximum Units on a Truck |
Python3 |
Easy |
Greedy, Sort |
| 1704 |
Determine if String Halves Are Alike |
Python3 |
Easy |
String |
| 1700 |
Number of Students Unable to Eat Lunch |
Python3 |
Easy |
Array |
| 1694 |
Reformat Phone Number |
Python3 |
Easy |
String |
| 1688 |
Count of Matches in Tournament |
Python3 |
Easy |
Backtracking |
| 1684 |
Count the Number of Consistent Strings |
Python3 |
Easy |
String |
| 1678 |
Goal Parser Interpretation |
Python3 |
Easy |
String |
| 1672 |
Richest Customer Wealth |
Python3 |
Easy |
Array |
| 1668 |
Maximum Repeating Substring |
Python3 |
Easy |
String |
| 1662 |
Check If Two String Arrays are Equivalent |
Python3 |
Easy |
String |
| 1656 |
Design an Ordered Stream |
Python3 |
Easy |
Design, Array |
| 1652 |
Defuse the Bomb |
Python3 |
Easy |
Array |
| 1646 |
Get Maximum in Generated Array |
Python3 |
Easy |
Array |
| 1640 |
Check Array Formation Through Concatenation |
Python3 |
Easy |
Sort, Array, Hash Table |
| 1636 |
Sort Array by Increasing Frequency |
Python3 |
Easy |
Sort, Array |
| 1629 |
Slowest Key |
Python3 |
Easy |
Array |
| 1624 |
Largest Substring Between Two Equal Characters |
Python3 |
Easy |
String |
| 1619 |
Mean of Array After Removing Some Elements |
Python3 |
Easy |
Array |
| 1614 |
Maximum Nesting Depth of the Parentheses |
Python3 |
Easy |
String |
| 1608 |
Special Array With X Elements Greater Than or Equal X |
Python3 |
Easy |
Array |
| 1603 |
Design Parking System |
Python3 |
Easy |
Design |
| 1598 |
Crawler Log Folder |
Python3 |
Easy |
Stack |
| 1592 |
Rearrange Spaces Between Words |
Python3 |
Easy |
String |
| 1588 |
Sum of All Odd Length Subarrays |
Python3 |
Easy |
Array |
| 1582 |
Special Positions in a Binary Matrix |
Python3 |
Easy |
Array |
| 1576 |
Replace All ?'s to Avoid Consecutive Repeating Characters |
Python3 |
Easy |
String |
| 1572 |
Matrix Diagonal Sum |
Python3 |
Easy |
Array |
| 1566 |
Detect Pattern of Length M Repeated K or More Times |
Python3 |
Easy |
Array |
| 1560 |
Most Visited Sector in a Circular Track |
Python3 |
Easy |
Array |
| 1556 |
Thousand Separator |
Python3 |
Easy |
String |
| 1550 |
Three Consecutive Odds |
Python3 |
Easy |
Array |
| 1544 |
Make The String Great |
Python3 |
Easy |
Stack, String |
| 1539 |
Kth Missing Positive Number |
Python3 |
Easy |
Array, Hash Table |
| 1534 |
Count Good Triplets |
Python3 |
Easy |
Array |
| 1528 |
Shuffle String |
Python3 |
Easy |
Sort |
| 1523 |
Count Odd Numbers in an Interval Range |
Python3 |
Easy |
Math |
| 1518 |
Water Bottles |
Python3 |
Easy |
Greedy |
| 1512 |
Number of Good Pairs |
Python3 |
Easy |
Array, Hash Table, Math |
| 1507 |
Reformat Date |
Python3 |
Easy |
String |
| 1502 |
Can Make Arithmetic Progression From Sequence |
Python3 |
Easy |
Sort, Array |
| 1496 |
Path Crossing |
Python3 |
Easy |
String |
| 1491 |
Average Salary Excluding the Minimum and Maximum Salary |
Python3 |
Easy |
Sort, Array |
| 1486 |
XOR Operation in an Array |
Python3 |
Easy |
Bit Manipulation, Array |
| 1480 |
Running Sum of 1d Array |
Python3 |
Easy |
Array |
| 1475 |
Final Prices With a Special Discount in a Shop |
Python3 |
Easy |
Array |
| 1470 |
Shuffle the Array |
Python3 |
Easy |
Array |
| 1464 |
Maximum Product of Two Elements in an Array |
Python3 |
Easy |
Array |
| 1460 |
Make Two Arrays Equal by Reversing Sub-arrays |
Python3 |
Easy |
Array |
| 1455 |
Check If a Word Occurs As a Prefix of Any Word in a Sentence |
Python3 |
Easy |
String |
| 1450 |
Number of Students Doing Homework at a Given Time |
Python3 |
Easy |
Array |
| 1446 |
Consecutive Characters |
Python3 |
Easy |
String |
| 1441 |
Build an Array With Stack Operations |
Python3 |
Easy |
Stack |
| 1436 |
Destination City |
Python3 |
Easy |
String |
| 1431 |
Kids With the Greatest Number of Candies |
Python3 |
Easy |
Array |
| 1422 |
Maximum Score After Splitting a String |
Python3 |
Easy |
String |
| 1417 |
Reformat The String |
Python3 |
Easy |
String |
| 1413 |
Minimum Value to Get Positive Step by Step Sum |
Python3 |
Easy |
Array |
| 1408 |
String Matching in an Array |
Python3 |
Easy |
String |
| 1403 |
Minimum Subsequence in Non-Increasing Order |
Python3 |
Easy |
Greedy, Sort |
| 1399 |
Count Largest Group |
Python3 |
Easy |
Array |
| 1394 |
Find Lucky Integer in an Array |
Python3 |
Easy |
Array |
| 1389 |
Create Target Array in the Given Order |
Python3 |
Easy |
Array |
| 1385 |
Find the Distance Value Between Two Arrays |
Python3 |
Easy |
Array |
| 1380 |
Lucky Numbers in a Matrix |
Python3 |
Easy |
Array |
| 1374 |
Generate a String With Characters That Have Odd Counts |
Python3 |
Easy |
String |
| 1370 |
Increasing Decreasing String |
Python3 |
Easy |
Sort, String |
| 1365 |
How Many Numbers Are Smaller Than the Current Number |
Python3 |
Easy |
Array, Hash Table |
| 1360 |
Number of Days Between Two Dates |
Python3 |
Easy |
None |
| 1356 |
Sort Integers by The Number of 1 Bits |
Python3 |
Easy |
Sort, Bit Manipulation |
| 1351 |
Count Negative Numbers in a Sorted Matrix |
Python3 |
Easy |
Array, Binary Search |
| 1346 |
Check If and Its Double Exist |
Python3 |
Easy |
Array |
| 1342 |
Number of Steps to Reduce a Number to Zero |
Python3 |
Easy |
Bit Manipulation |
| 1337 |
The K Weakest Rows in a Matrix |
Python3 |
Easy |
Array, Binary Search |
| 1332 |
Remove Palindromic Subsequences |
Python3 |
Easy |
String |
| 1331 |
Rank Transform of an Array |
Python3 |
Easy |
Array |
| 1323 |
Maximum 69 Number |
Python3 |
Easy |
Math |
| 1317 |
Convert Integer to the Sum of Two No-Zero Integers |
Python3 |
Easy |
Math |
| 1313 |
Decompress Run-Length Encoded List |
Python3 |
Easy |
Array |
| 1309 |
Decrypt String from Alphabet to Integer Mapping |
Python3 |
Easy |
String |
| 1304 |
Find N Unique Integers Sum up to Zero |
Python3 |
Easy |
Array |
| 1299 |
Replace Elements with Greatest Element on Right Side |
Python3 |
Easy |
Array |
| 1295 |
Find Numbers with Even Number of Digits |
Python3 |
Easy |
Array |
| 1290 |
Convert Binary Number in a Linked List to Integer |
Python3 |
Easy |
Bit Manipulation, Linked List |
| 1287 |
Element Appearing More Than 25% In Sorted Array |
Python3 |
Easy |
Array |
| 1281 |
Subtract the Product and Sum of Digits of an Integer |
Python3 |
Easy |
Math |
| 1275 |
Find Winner on a Tic Tac Toe Game |
Python3 |
Easy |
Array |
| 1266 |
Minimum Time Visiting All Points |
Python3 |
Easy |
Geometry, Array |
| 1260 |
Shift 2D Grid |
Python3 |
Easy |
Array |
| 1252 |
Cells with Odd Values in a Matrix |
Python3 |
Easy |
Array |
| 1237 |
Find Positive Integer Solution for a Given Equation |
Python3 |
Easy |
Math, Binary Search |
| 1232 |
Check If It a Straight Line |
Python3 |
Easy |
Geometry, Array, Math |
| 1221 |
Split a String in Balanced Strings |
Python3 |
Easy |
Greedy, String |
| 1217 |
Minimum Cost to Move Chips to The Same Position |
Python3 |
Easy |
Greedy, Array, Math |
| 1207 |
Unique Number of Occurrences |
Python3 |
Easy |
Hash Table |
| 1200 |
Minimum Absolute Difference |
Python3 |
Easy |
Array |
| 1189 |
Maximum Number of Balloons |
Python3 |
Easy |
Hash Table, String |
| 1185 |
Day of the Week |
Python3 |
Easy |
Array |
| 1184 |
Distance Between Bus Stops |
Python3 |
Easy |
Array |
| 1175 |
Prime Arrangements |
Python3 |
Easy |
Math |
| 1170 |
Compare Strings by Frequency of the Smallest Character |
Python3 |
Easy |
Array, String |
| 1160 |
Find Words That Can Be Formed by Characters |
Python3 |
Easy |
Array, Hash Table |
| 1154 |
Day of the Year |
Python3 |
Easy |
Math |
| 1137 |
N-th Tribonacci Number |
Python3 |
Easy |
Recursion |
| 1128 |
Number of Equivalent Domino Pairs |
Python3 |
Easy |
Array |
| 1122 |
Relative Sort Array |
Python3 |
Easy |
Sort, Array |
| 1108 |
Defanging an IP Address |
Python3 |
Easy |
String |
| 1103 |
Distribute Candies to People |
Python3 |
Easy |
Math |
| 1089 |
Duplicate Zeros |
Python3 |
Easy |
Array |
| 1078 |
Occurrences After Bigram |
Python3 |
Easy |
Hash Table |
| 1071 |
Greatest Common Divisor of Strings |
Python3 |
Easy |
String |
| 1051 |
Height Checker |
Python3 |
Easy |
Array |
| 1047 |
Remove All Adjacent Duplicates In String |
Python3 |
Easy |
Stack |
| 1046 |
Last Stone Weight |
Python3 |
Easy |
Heap, Greedy |
| 1037 |
Valid Boomerang |
Python3 |
Easy |
Math |
| 1033 |
Moving Stones Until Consecutive |
Python3 |
Easy |
Brainteaser |
| 1030 |
Matrix Cells in Distance Order |
Python3 |
Easy |
Sort |
| 1025 |
Divisor Game |
Python3 |
Easy |
Math, Dynamic Programming |
| 1022 |
Sum of Root To Leaf Binary Numbers |
Python3 |
Easy |
Tree |
| 1021 |
Remove Outermost Parentheses |
Python3 |
Easy |
Stack |
| 1018 |
Binary Prefix Divisible by 5 |
Python3 |
Easy |
Array |
| 1013 |
Partition Array Into Three Parts With Equal Sum |
Python3 |
Easy |
Array |
| 1010 |
Pairs of Songs With Total Durations Divisible by 60 |
Python3 |
Easy |
Array |
| 1009 |
Complement of Base 10 Integer |
Python3 |
Easy |
Math |
| 1005 |
Maximize Sum of Array After K Negations |
Python3 |
Easy |
Greedy |
| 1002 |
Find Common Characters |
Python3 |
Easy |
Array, Hash Table |
| 999 |
Available Captures for Rook |
Python3 |
Easy |
Array |
| 997 |
Find the Town Judge |
Python3 |
Easy |
Graph |
| 993 |
Cousins in Binary Tree |
Python3 |
Easy |
Tree, Breadth-first Search |
| 989 |
Add to Array-Form of Integer |
Python3 |
Easy |
Array |
| 985 |
Sum of Even Numbers After Queries |
Python3 |
Easy |
Array |
| 977 |
Squares of a Sorted Array |
Python3 |
Easy |
Array, Two Pointers |
| 976 |
Largest Perimeter Triangle |
Python3 |
Easy |
Sort, Math |
| 970 |
Powerful Integers |
Python3 |
Easy |
Hash Table, Math |
| 965 |
Univalued Binary Tree |
Python3 |
Easy |
Tree |
| 961 |
N-repeated Element in Size 2N Array |
Python3 |
Easy |
Hash Table |
| 953 |
Verifying an Alien Dictionary |
Python3 |
Easy |
Hash Table |
| 944 |
Delete Columns to Make Sorted |
Python3 |
Easy |
Greedy |
| 942 |
DI String Match |
Python3 |
Easy |
Math |
| 941 |
Valid Mountain Array |
Python3 |
Easy |
Array |
| 938 |
Range Sum of BST |
Python3 |
Easy |
Tree, Recursion |
| 937 |
Reorder Data in Log Files |
Python3 |
Easy |
String |
| 933 |
Number of Recent Calls |
Python3 |
Easy |
Queue |
| 929 |
Unique Email Addresses |
Python3 |
Easy |
String |
| 925 |
Long Pressed Name |
Python3 |
Easy |
Two Pointers, String |
| 922 |
Sort Array By Parity II |
Python3 |
Easy |
Sort, Array |
| 917 |
Reverse Only Letters |
Python3 |
Easy |
String |
| 914 |
X of a Kind in a Deck of Cards |
Python3 |
Easy |
Array, Math |
| 908 |
Smallest Range I |
Python3 |
Easy |
Math |
| 905 |
Sort Array by Parity |
Python3 |
Easy |
Array |
| 897 |
Increasing Order Search Tree |
Python3 |
Easy |
Tree, Depth-first Search |
| 896 |
Monotonic Array |
Python3 |
Easy |
Array |
| 893 |
Groups of Special-Equivalent Strings |
Python3 |
Easy |
String |
| 892 |
Surface Area of 3D Shapes |
Python3 |
Easy |
Geometry, Math |
| 888 |
Fair Candy Swap |
Python3 |
Easy |
Array |
| 884 |
Uncommon Words from Two Sentences |
Python3 |
Easy |
Hash Table |
| 883 |
Projection Area of 3D shapes |
Python3 |
Easy |
Math |
| 876 |
Middle of the Linked List |
Python3 |
Easy |
Linked List |
| 874 |
Walking Robot Simulation |
Python3 |
Easy |
Greedy |
| 872 |
Leaf-Similar Tree |
Python3 |
Easy |
Tree, Depth-first Search |
| 868 |
Binary Gap |
Python3 |
Easy |
Math |
| 867 |
Transpose Matrix |
Python3 |
Easy |
Array |
| 860 |
Lemonade Change |
Python3 |
Easy |
Greedy |
| 859 |
Buddy Strings |
Python3 |
Easy |
String |
| 852 |
Peak Index in a Mountain Array |
Python3 |
Easy |
Binary Search |
| 844 |
Backspace String Compare |
Python3 |
Easy |
Stack, Two Pointers |
| 836 |
Rectangle Overlap |
Python3 |
Easy |
Math |
| 832 |
Flipping an Image |
Python3 |
Easy |
Array |
| 830 |
Position of Large Groups |
Python3 |
Easy |
Array |
| 824 |
Goat Latin |
Python3 |
Easy |
String |
| 821 |
Shortest Distance to a Character |
Python3 |
Easy |
None |
| 819 |
Most Common Word |
Python3 |
Easy |
String |
| 812 |
Largest Triangle Area |
Python3 |
Easy |
Math |
| 811 |
Subdomain Visit Count |
Python3 |
Easy |
Hash Table |
| 806 |
Number of Lines To Write String |
Python3 |
Easy |
None |
| 804 |
Unique Morse Code Words |
Python3 |
Easy |
String |
| 796 |
Rotate String |
Python3 |
Easy |
None |
| 788 |
Rotated Digits |
Python3 |
Easy |
String |
| 783 |
Minimum Distance Between BST Nodes |
Python3 |
Easy |
Tree, Recursion |
| 771 |
Jewels and Stones |
Python3 |
Easy |
Hash Table |
| 766 |
Toeplitz Matrix |
Python3 |
Easy |
Array |
| 762 |
Prime Number of Set Bits in Binary Representation |
Python3 |
Easy |
Bit Manipulation |
| 748 |
Shortest Completing Word |
Python3 |
Easy |
Hash Table |
| 747 |
Largest Number At Least Twice of Others |
Python3 |
Easy |
Array |
| 746 |
Min Cost Climbing Stairs |
Python3 |
Easy |
Array, Dynamic Programming |
| 744 |
Find Smallest Letter Greater Than Target |
Python3 |
Easy |
Binary Search |
| 733 |
Flood Fill |
Python3 |
Easy |
Depth-first Search |
| 728 |
Self Dividing Numbers |
Python3 |
Easy |
Math |
| 724 |
Find Pivot Index |
Python3 |
Easy |
Array |
| 720 |
Longest Word in Dictionary |
Python3 |
Easy |
Trie, Hash Table |
| 717 |
1-bit and 2-bit Characters |
Python3 |
Easy |
Array |
| 709 |
To Lower Case |
Python3 |
Easy |
String |
| 706 |
Design HashMap |
Python3 |
Easy |
Design, Hash Table |
| 705 |
Design HashSet |
Python3 |
Easy |
Design, Hash Table |
| 704 |
Binary Search |
Python3 |
Easy |
Binary Search |
| 703 |
Kth Largest Element in a Stream |
Python3 |
Easy |
Heap |
| 700 |
Search in a Binary Search Tree |
Python3 |
Easy |
Tree |
| 697 |
Degree of an Array |
Python3 |
Easy |
Array |
| 696 |
Count Binary Substrings |
Python3 |
Easy |
String |
| 693 |
Binary Number with Alternating bits |
Python3 |
Easy |
Bit Manipulation |
| 690 |
Employee Importance |
Python3 |
Easy |
Depth-first Search, Breadth-first Search, Hash Table |
| 687 |
Longest Univalue Path |
Python3 |
Easy |
Tree, Recursion |
| 686 |
Repeated String Match |
Python3 |
Easy |
String |
| 682 |
Baseball Game |
Python3 |
Easy |
Stack |
| 680 |
Valid Palindrome II |
Python3 |
Easy |
String |
| 674 |
Longest Continuous Increasing Subsequence |
Python3 |
Easy |
Array |
| 671 |
Second Minimum Node in a Binary Tree |
Python3 |
Easy |
Tree |
| 669 |
Trim a Binary Search Tree |
Python3 |
Easy |
Tree |
| 665 |
Non-decreasing Array |
Python3 |
Easy |
Array |
| 661 |
Image Smoother |
Python3 |
Easy |
Array |
| 657 |
Robot Return to Origin |
Python3 |
Easy |
String |
| 653 |
Two Sum IV - Input is a BST |
Python3 |
Easy |
Tree |
| 645 |
Set Mismatch |
Python3 |
Easy |
Hash Table, Math |
| 643 |
Maximum Average Subarray I |
Python3 |
Easy |
Array |
| 637 |
Average of Levels in Binary Tree |
Python3 |
Easy |
Tree |
| 633 |
Sum of Square Numbers |
Python3 |
Easy |
Math |
| 628 |
Maximum Product of Three Numbers |
Python3 |
Easy |
Array, Math |
| 621 |
Task Scheduler |
Java |
中等 |
贪心, 数组, 哈希表, 计数, 排序, 堆(优先队列) |
| 617 |
Merge Two Binary Trees |
Python3 |
Easy |
Tree |
| 606 |
Construct String from Binary Tree |
Python3 |
Easy |
Tree, String |
| 605 |
Can Place Flowers |
Python3 |
Easy |
Array |
| 599 |
Minimum Index Sum of Two Lists |
Python3 |
Easy |
Hash Table |
| 598 |
Range Addition II |
Python3 |
Easy |
Math |
| 594 |
Longest Harmonious Subsequence |
Python3 |
Easy |
Hash Table |
| 590 |
N-ary Tree Postorder Traversal |
Python3 |
Easy |
Tree |
| 589 |
N-ary Tree Preorder Traversal |
Python3 |
Easy |
Tree |
| 581 |
Shortest Unsorted Continuous Subarray |
Python3 |
Easy |
Array |
| 575 |
Distribute Candies |
Python3 |
Easy |
Hash Table |
| 572 |
Subtree of Another Tree |
Python3 |
Easy |
Tree |
| 566 |
Reshape the Matrix |
Python3 |
Easy |
Array |
| 563 |
Binary Tree Tilt |
Python3 |
Easy |
Tree |
| 561 |
Array Partition I |
Python3 |
Easy |
Array |
| 559 |
Maximum Depth of N-ary Tree |
Python3 |
Easy |
Tree, Depth-first Search, Breadth-first Search |
| 557 |
Reverse Words in a String III |
Python3 |
Easy |
String |
| 551 |
Student Attendance Record I |
Python3 |
Easy |
Tree |
| 543 |
Diameter of Binary Tree |
Python3 |
Easy |
Tree |
| 541 |
Reverse String II |
Python3 |
Easy |
String |
| 538 |
Convert BST to Greater Tree |
Python3 |
Easy |
Tree |
| 532 |
K-diff Pairs in an Array |
Python3 |
Easy |
Array, Two Pointers |
| 530 |
Minimum Absolute Difference in BST |
Python3 |
Easy |
Tree |
| 521 |
Longest Uncommon Subsequence I |
Python3 |
Easy |
String |
| 520 |
Detect Capital |
Python3 |
Easy |
String |
| 509 |
Fibonacci Number |
Python3 |
Easy |
Array |
| 507 |
Perfect Number |
Python3 |
Easy |
Math |
| 506 |
Relative Ranks |
Python3 |
Easy |
None |
| 504 |
Base 7 |
Python3 |
Easy |
None |
| 501 |
Find Mode in Binary Search Tree |
Python3 |
Easy |
Tree |
| 500 |
Keyboard Row |
Python3 |
Easy |
Hash Table |
| 496 |
Next Greater Element I |
Python3 |
Easy |
Stack |
| 492 |
Construct the Rectangle |
Python3 |
Easy |
None |
| 485 |
Max Consecutive Ones |
Python3 |
Easy |
Array |
| 482 |
License Key Formatting |
Python3 |
Easy |
None |
| 476 |
Number Complement |
Python3 |
Easy |
Bit Manipulation |
| 475 |
Heaters |
Python3 |
Easy |
Binary Search |
| 463 |
Island Perimeter |
Python3 |
Easy |
Hash Table |
| 461 |
Hamming Distance |
Python3, Java |
Easy |
Bit Manipulation |
| 459 |
Repeated Substring Pattern |
Python3 |
Easy |
String |
| 455 |
Assign Cookies |
Python3 |
Easy |
Greedy |
| 453 |
Minimum Moves to Equal Array Elements |
Python3 |
Easy |
Math |
| 448 |
Find All Numbers Disappeared in an Array |
Python3 |
Easy |
Array |
| 447 |
Number of Boomerangs |
Python3 |
Easy |
Hash Table |
| 443 |
String Compression |
Python3 |
Easy |
String |
| 441 |
Arranging Coins |
Python3 |
Easy |
Math, Binary Search |
| 437 |
Path Sum III |
Python3 |
Easy |
Tree |
| 434 |
Number of Segments in a String |
Python3 |
Easy |
String |
| 415 |
Add Strings |
Python3 |
Easy |
String |
| 414 |
Third Maximum Number |
Python3 |
Easy |
Array |
| 412 |
Fizz Buzz |
Python3, Java |
Easy |
None |
| 409 |
Longest Palindrome |
Python3 |
Easy |
Hash Table |
| 405 |
Convert a Number to Hexadecimal |
Python3 |
Easy |
Bit Manipulation |
| 403 |
Sum of Left Leaves |
Python3 |
Easy |
Tree |
| 401 |
Binary Watch |
Python3 |
Easy |
Bit Manipulation, Backtracking |
| 392 |
Is Subsequence |
Python3 |
Easy |
Greedy, Binary Search, Dynamic Programming |
| 389 |
Find the Difference |
Python3 |
Easy |
Bit Manipulation, Hash Table |
| 387 |
First Unique CHaracter in a String |
Python3, Java |
Easy |
Hash Table, String |
| 384 |
Shuffle an Array |
Java |
Medium |
Array, Math, Randomized |
| 383 |
Ransom Note |
Python3 |
Easy |
String |
| 380 |
Insert Delete GetRandom O(1) |
Java |
Medium |
Design, Array, Hash Table, Math, Randomized |
| 374 |
Guess Number Higher or Lower |
Python3 |
Easy |
Binary Search |
| 371 |
Sum of Two Integers |
Python3 |
Easy |
Bit Manipulation |
| 367 |
Valid Perfect Square |
Python3 |
Easy |
Math, Binary Search |
| 350 |
Intersection of Two Arrays II |
Python3, Java |
Easy |
Sort, Hash Table, Two Pointers, Binary Search |
| 349 |
Intersection of Two Arrays |
Python3 |
Easy |
Sort, Hash Table, Two Pointers, Binary Search |
| 347 |
Top K Frequent Elements |
Java |
Medium |
Array, Hash Table, Divide and Conquer, Bucket Sort, Counting, Quickselect, Sorting, Heap(Priority Queue) |
| 345 |
Reverse Vowels of a String |
Python3 |
Easy |
Two Pointers, String |
| 344 |
Reverse String |
Python3, Java |
Easy |
Two Pointers, String |
| 342 |
Power of Four |
Python3 |
Easy |
Bit Manipulation |
| 334 |
Increasing Triplet Subsequence |
Java |
Medium |
Greedy, Array |
| 328 |
Odd Even Linked List |
Java |
Medium |
Linked List |
| 326 |
Power of Three |
Python3, Java |
Easy |
Math |
| 322 |
Coin Change |
Java |
Medium |
Breadth-First, Array, Dynamic Programming |
| 303 |
Range Sum Query - Immutable |
Python3 |
Easy |
Dynamic Programming |
| 300 |
Longest Increasing Subsequence |
Java |
Medium |
Array, Binary Search, Dynamic Programming |
| 299 |
Bulls and Cows |
Python3 |
Easy |
Hash Table |
| 292 |
Nim Game |
Python3 |
Easy |
Brainteaser, Minimax |
| 297 |
Serialize and Deserialize Binary Tree |
Java |
Hard |
Tree, Depth-First Search, Breadth-First Search, Design, String, Binary Tree |
| 290 |
Word Pattern |
Python3 |
Easy |
Hash Table |
| 283 |
Move Zeroes |
Python3, Java |
Easy |
Array, Two Pointers |
| 278 |
First Bad Version |
Python3, Java |
Easy |
Binary Search |
| 268 |
Missing Number |
Python3, Java |
Easy |
Bit Manipulation, Array, Math |
| 263 |
Ugly Number |
Python3 |
Easy |
Math |
| 258 |
Add Digits |
Python3 |
Easy |
Math |
| 257 |
Binary Tree Paths |
Python3 |
Easy |
Tree, Depth-first Search |
| 242 |
Valid Anagram |
Python3, Java |
Easy |
Sort, Hash Table |
| 240 |
Search a 2D Matrix II |
Java |
Medium |
Array, Binary Search, Divide and Conquer, Matrix |
| 237 |
Delete Node in a Linked List |
Python3, Java |
Easy |
Linked List |
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
Python3 |
Easy |
Tree |
| 234 |
Palindrome Linked List |
Python3, Java |
Easy |
Linked List, Two Pointers |
| 232 |
Implement Queue using Stacks |
Python3 |
Easy |
Stack, Design |
| 231 |
Power of Two |
Python3 |
Easy |
Bit Manipulation, Math |
| 230 |
Kth Smallest Element in a BST |
Java |
Medium |
Tree, Depth-First Search, Binary Search Tree, Binary Tree |
| 228 |
Summary Ranges |
Python3 |
Easy |
Array |
| 226 |
Invert Binary Tree |
Python3 |
Easy |
Tree |
| 225 |
Implement Stack using Queues |
Python3 |
Easy |
Stack, Design |
| 219 |
Contains Duplicate II |
Python3 |
Easy |
Array, Hash Table |
| 217 |
Contains Duplicate |
Python3, Java |
Easy |
Array, Hash Table |
| 215 |
Kth Largest Element in an Array |
Java |
Medium |
Array, Divide and Conquer, Quickselect, Sorting, Heap(Priority Queue) |
| 206 |
Reverse Linked List |
Python3, Java |
Easy |
Linked List |
| 205 |
Isomorphic Strings |
Python3 |
Easy |
Hash Table |
| 204 |
Count Primes |
Python3, Java |
Easy |
Hash Table, Math |
| 203 |
Remove Linked List Elements |
Python3 |
Easy |
Linked List |
| 202 |
Happy Number |
Python3, Java |
Easy |
Hash Table, Math |
| 200 |
Number of Islands |
Java |
Medium |
Depth-First Search, Breadth-First Search, Union Find, Array, Matrix |
| 198 |
House Robber |
Python3, Java |
Easy |
Dynamic Programming |
| 191 |
Number of 1 Bits |
Python3, Java |
Easy |
Bit Manipulation |
| 190 |
Reverse Bits |
Python3, Java |
Easy |
Bit Manipulation |
| 189 |
Rotate Array |
Python3, Java |
Easy |
Array |
| 187 |
Repeated DNA Sequences |
Python3 |
Medium |
Bit Manipulation, Hash Table, String, Sliding Windows, Hash Function, Rolling Hash |
| 179 |
Largest Number |
Python3 |
Medium |
Greedy, String, Sorting |
| 173 |
Binary Search Tree Iterator |
Python3 |
Medium |
Stack, Tree, Design, Binary Search Tree, Binary Tree, Iterator |
| 172 |
Factorial Trailing Zeroes |
Python3, Java |
Easy |
Math |
| 171 |
Excel Sheet Column Number |
Python3, Java |
Easy |
Math |
| 169 |
Majority Element |
Python3, Java |
Easy |
Bit Manipulation, Array, Divide and Conquer |
| 168 |
Excel Sheet Column Title |
Python3 |
Easy |
Math |
| 167 |
Two Sum II - Input Array is Sorted |
Python3 |
Easy |
Array, Two Pointers, Binary Search |
| 166 |
Fraction to Recurring Decimal |
Python3 |
Medium |
Hash Table, Math, String |
| 165 |
Compare Version Numbers |
Python3 |
Medium |
String |
| 162 |
Find Peak Element |
Python3, Java |
Medium |
Array, Binary Search |
| 160 |
Intersection of Two Linked Lists |
Python3, Java |
Easy |
Linked List |
| 155 |
Min Stack |
Python3, Java |
Easy |
Stack, Design |
| 153 |
Find Minimum in Rotated Sorted Array |
Python3 |
Medium |
Array, Binary Search |
| 152 |
Maximum Product Subarray |
Python3 |
Medium |
Array, Dynamic Programming |
| 151 |
Reverse Words in a String |
Python3 |
Medium |
String |
| 150 |
Evaluate Reverse Polish Notation |
Python3 |
Medium |
Stack |
| 148 |
Sort List |
Python3 |
Medium |
Sort, Linked List |
| 147 |
Insertion Sort List |
Python3 |
Medium |
Sort, Linked List |
| 146 |
LRU Cache |
Python3 |
Medium |
Design |
| 144 |
Binary Tree Preorder Traversal |
Python3 |
Medium |
Stack, Tree |
| 143 |
Reorder List |
Python3 |
Medium |
Linked List |
| 142 |
Linked List Cycle II |
Python3 |
Medium |
Linked List, Two Pointers |
| 141 |
Linked List Cycle |
Python3, Java |
Easy |
Linked List, Two Pointers |
| 139 |
Word Break |
Python3 |
Medium |
Dynamic Programming |
| 138 |
Copy List with Random Pointer |
Python3 |
Medium |
Hash Table, Linked List |
| 137 |
Single Number II |
Python3 |
Medium |
Bit Manipulation |
| 136 |
Single Number |
Python3, Java |
Easy |
Bit Manipulation, Hash Table |
| 134 |
Gas Station |
Python3 |
Medium |
Greedy |
| 133 |
Clone Graph |
Python3 |
Medium |
Depth-first Search, Breadth-first Search, Graph |
| 131 |
Palindrome Partitioning |
Python3 |
Medium |
Depth-first Search, Dynamic Programming, Backtracking |
| 130 |
Surrounded Regions |
Python3 |
Medium |
Depth-first Search, Breadth-first Search, Union Find |
| 129 |
Sum Root to Leaf Numbers |
Python3 |
Medium |
Tree, Depth-first Search |
| 128 |
Longest Consecutive Sequence |
Python3 |
Medium |
Union Find, Array |
| 125 |
Valid Palindrome |
Python3, Java |
Easy |
Two Pointers, String |
| 122 |
Best Time to Buy and Sell Stock II |
Python3, Java |
Easy |
Greedy, Array |
| 121 |
Best Time to Buy and Sell Stock |
Python3, Java |
Easy |
Array, Dynamic Programming |
| 120 |
Triangle |
Python3 |
Medium |
Array, Dynamic Programming |
| 119 |
Pascal's Triangle II |
Python3 |
Easy |
Array |
| 118 |
Pascal's Triangle |
Python3, Java |
Easy |
Array |
| 117 |
Populating Next Right Pointers in Each Node |
Python3 |
Medium |
Tree, Depth-first Search |
| 116 |
Populating Next Right Pointers in Each Node |
Python3, Java |
Medium |
Tree, Depth-first Search, Breadth-first Search |
| 114 |
Flatten Binary Tree to Linked List |
Python3 |
Medium |
Tree, Depth-first Search |
| 113 |
Path Sum II |
Python3 |
Medium |
Tree, Depth-first Search |
| 112 |
Path Sum |
Python3 |
Easy |
Tree, Depth-first Search |
| 111 |
Minimum Depth of Binary Tree |
Python3 |
Easy |
Tree, Depth-first Search, Breadth-first Search |
| 110 |
Balanced Binary Tree |
Python3 |
Easy |
Tree, Depth-first Search |
| 109 |
Convert Sorted List to Binary Search Tree |
Python3 |
Medium |
Depth-first Search, Linked List |
| 108 |
Convert Sorted Array to Binary Search Tree |
Python3, Java |
Easy |
Tree, Depth-first Search |
| 107 |
Binary Tree Level Order Traversal II |
Python3 |
Easy |
Tree, Breadth-first Search |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Python3 |
Medium |
Tree, Depth-first Search, Array |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Python3, Java |
Medium |
Tree, Depth-first Search, Array |
| 104 |
Maximum Depth of Binary Tree |
Python3, Java |
Easy |
Tree, Depth-first Search |
| 103 |
Binary Tree Zigzag Level Order Traversal |
Java |
Medium |
Tree, Breadth-First Search, Binary Tree |
| 102 |
Binary Tree Level Order Traversal |
Python3, Java |
Medium |
Tree, Breadth-first Search |
| 101 |
Symmetric Tree |
Python3, Java |
Easy |
Tree, Depth-first Search, Breadth-first Search |
| 100 |
Same Tree |
Python3 |
Easy |
Tree, Depth-first Search |
| 98 |
Validate Binary Search Tree |
Python3, Java |
Medium |
Tree, Depth-first Search, Recursion |
| 97 |
Interleaving String |
Python3 |
Medium |
String, Dynamic Programming |
| 96 |
Unique Binary Search Trees |
Python3 |
Medium |
Tree, Dynamic Programming |
| 95 |
Unique Binary Search Trees II |
Python3 |
Medium |
Tree, Dynamic Programming |
| 94 |
Binary Tree Inorder Traversal |
Python3, Java |
Medium |
Stack, Tree, Hash Table |
| 93 |
Restore IP Addresses |
Python3 |
Medium |
String, Backtracking |
| 92 |
Reverse Linked List II |
Python3 |
Medium |
Linked List |
| 91 |
Decode Ways |
Python3 |
Medium |
String, Dynamic Programming |
| 90 |
Subsets II |
Python3 |
Medium |
Array, Backtracking |
| 89 |
Gray Code |
Python3 |
Medium |
Backtracking |
| 88 |
Merge Sorted Array |
Python3, Java |
Easy |
Array, Two Pointers |
| 86 |
Partition List |
Python3 |
Medium |
Linked List, Two Pointers |
| 83 |
Remove Duplicates from Sorted List |
Python3 |
Easy |
Linked List |
| 82 |
Remove Duplicates from Sorted List II |
Python3 |
Medium |
Linked List |
| 81 |
Search in Rotated Sorted Array II |
Python3 |
Medium |
Array, Binary Search |
| 80 |
Remove Duplicates from Sorted Array II |
Python3 |
Medium |
Array, Two Pointers |
| 79 |
Word Search |
Python3, Java |
Medium |
Array, Backtracking |
| 78 |
Subsets |
Python3, Java |
Medium |
Bit Manipulation, Array, Backtracking |
| 77 |
Combinations |
Python3 |
Medium |
Backtracking |
| 75 |
Sort Colors |
Python3, Java |
Medium |
Sort, Array, Two Pointers |
| 74 |
Search a 2D Matrix |
Python3 |
Medium |
Array, Binary Search |
| 73 |
Set Matrix Zeroes |
Python3, Java |
Medium |
Array |
| 71 |
Simplify Path |
Python3 |
Medium |
Stack, String |
| 70 |
Climbing Stairs |
Python3, Java |
Easy |
Dynamic Programming |
| 69 |
Sqrt(x) |
Python3, Java |
Easy |
Math, Binary Search |
| 67 |
Add Binary |
Python3 |
Easy |
Math, String |
| 66 |
Plus One |
Python3, Java |
Easy |
Array |
| 64 |
Minimum Path Sum |
Python3 |
Medium |
Array, Dynamic Programming |
| 63 |
Unique Paths II |
Python3 |
Medium |
Array, Dynamic Programming |
| 62 |
Unique Paths |
Python3, Java |
Medium |
Array, Dynamic Programming |
| 61 |
Rotate List |
Python3 |
Medium |
Linked List, Two Pointers |
| 59 |
Spiral Matrix II |
Python3 |
Medium |
Array |
| 58 |
Length of Last Word |
Python3 |
Easy |
String |
| 57 |
Insert Interval |
Python3 |
Medium |
Sort, Array |
| 56 |
Merge Intervals |
Python3, Java |
Medium |
Sort, Array |
| 55 |
Jump Game |
Python3, Java |
Medium |
Greedy, Array |
| 54 |
Spiral Matrix |
Python3 |
Medium |
Array |
| 53 |
Maximum Subarray |
Python3, Java |
Easy |
Array, Divide and Conquer, Dynamic Programming |
| 50 |
Pow(x, n) |
Python3, Java |
Medium |
Math, Binary Search |
| 49 |
Group Anagrams |
Python3, Java |
Medium |
Hash Table, String |
| 48 |
Rotate Image |
Python3, Java |
Medium |
Array |
| 47 |
Permutations II |
Python3 |
Medium |
Backtracking |
| 46 |
Permutations |
Python3, Java |
Medium |
Backtracking |
| 45 |
Jump Game II |
Python3 |
Medium |
Greedy, Array |
| 43 |
Multiply Strings |
Python3 |
Medium |
Math, String |
| 40 |
Combination Sum II |
Python3 |
Medium |
Array, Backtracking |
| 39 |
Combination Sum |
Python3 |
Medium |
Array, Backtracking |
| 38 |
Count And Say |
Python3, Java |
Easy |
String |
| 36 |
Valid Sudoku |
Python3, Java |
Medium |
Hash Table |
| 35 |
Search Insert Position |
Python3 |
Easy |
Array, Binary Search |
| 34 |
Find First and Last Position of Element in Sorted Array |
Python3, Java |
Medium |
Array, Binary Search |
| 33 |
Search in Rotated Sorted Array |
Python3, Java |
Medium |
Array, Binary Search |
| 31 |
Next Permutation |
Python3 |
Medium |
Array |
| 29 |
Divide Two Integers |
Python3, Java |
Medium |
Math, Binary Search |
| 28 |
Implement strStr() |
Python3, Java |
Easy |
Two Pointers, String |
| 27 |
Remove Element |
Python3 |
Easy |
Array, Two Pointers |
| 26 |
Remove Duplicates From Sorted Array |
Python3, Java |
Easy |
Array, Two Pointers |
| 24 |
Swap Nodes in Pairs |
Python3 |
Medium |
Recursion, Linked List |
| 22 |
Generate Parentheses |
Python3, Java |
Medium |
String, Backtracking |
| 21 |
Merge Two Sorted Lists |
Python3, Java |
Easy |
Linked List |
| 20 |
Valid Parentheses |
Python3, Java |
Easy |
Stack, String |
| 19 |
Remove Nth Node From End of List |
Python3, Java |
Medium |
Linked List, Two Pointers |
| 18 |
4Sum |
Python3 |
Medium |
Array, Hash Table, Two Pointers |
| 17 |
Letter Combinations of a Phone Number |
Python3, Java |
Medium |
Depth-first Search, Recursion, String, Backtracking |
| 16 |
3Sum Closest |
Python3 |
Medium |
Array, Two Pointers |
| 15 |
3Sum |
Python3, Java |
Medium |
Array, Two Pointers |
| 14 |
Longest Common Prefix |
Python3, Java |
Easy |
String |
| 13 |
Roman to Integer |
Python3, Java |
Easy |
Math, String |
| 12 |
Integer to Roman |
Python3 |
Medium |
Math, String |
| 11 |
Container With Most Water |
Python3 |
Medium |
Array, Two Pointers |
| 9 |
Palindrome Number |
Python3 |
Easy |
Math |
| 8 |
String to Integer (atoi) |
Python3, Java |
Medium |
Math, String |
| 7 |
Reverse Integer |
Python3, Java |
Easy |
Math |
| 6 |
Zigzag Conversion |
Python3 |
Medium |
String |
| 5 |
Longest Palindromic Substring |
Python3, Java |
Medium |
String, Dynamic Programming |
| 3 |
Longest Substring Without Repeating Characters |
Python3, Java |
Medium |
Hash Table, Two Pointers, String, Sliding Window |
| 2 |
Add Two Numbers |
Python3, Java |
Medium |
Recursion, Linked List, Math |
| 1 |
Two Sum |
Python3, Java |
Easy |
Array, Hash Table |
