| 1 |
Two Sum |
Easy |
 |
| 7 |
Reverse Integer |
Easy |
|
| 9 |
PalindromeNumber |
Easy |
|
| 13 |
Roman To Integer |
Easy |
|
| 14 |
Longest Common Prefix |
Easy |
|
| 20 |
ValidParentheses |
Easy |
|
| 21 |
Merge 2 Sorted Lists |
Easy |
|
| 26 |
Remove Duplicates From Sorted Array |
Easy |
|
| 27 |
Remove Element |
Easy |
 |
| 28 |
Needle in Haystack |
Easy |
|
| 35 |
Search Inserted Position |
Easy |
|
| 38 |
Count and Say |
Easy |
|
| 53 |
Maximum SubArray |
Easy |
|
| 58 |
Length of Last Word |
Easy |
|
| 66 |
Plus One |
Easy |
|
| 67 |
Add Binary |
Easy |
|
| 69 |
Sqrt(x) |
Easy |
|
| 70 |
Climbing Stairs |
Easy |
|
| 83 |
Remove Duplicates from Sorted List |
Easy |
|
| 88 |
Merge Sorted Array |
Easy |
|
| 100 |
Same Tree |
Easy |
|
| 101 |
Symmetric Tree |
Easy |
|
| 104 |
Maximum Depth of Binary Tree |
Easy |
|
| 107 |
Binary Tree Level Order Traversal II |
Easy |
|
| 108 |
Convert Sorted Array To Binary Search Tree |
Easy |
|
| 110 |
Balanced Binary Tree |
Easy |
|
| 111 |
Minimum Depth of Binary Tree |
Easy |
|
| 112 |
Path Sum |
Easy |
|
| 118 |
Pascal's Triangle |
Easy |
|
| 119 |
Pascal's Triangle II |
Easy |
|
| 121 |
Best Time to Buy and Sell Stocks |
Easy |
|
| 122 |
Best Time to Buy and Sell Stocks II |
Easy |
|
| 125 |
Valid Palindrome |
Easy |
|
| 136 |
Single Number |
Easy |
|
| 141 |
Linked List Cycle |
Easy |
|
| 155 |
Min Stack |
Easy |
|
| 157 |
Read N Characters Given Read4 |
Easy |
|
| 160 |
Intersection of Two Linked Lists |
Easy |
|
| 167 |
Two Sum II - Input Array is Sorted |
Easy |
|
| 168 |
Excel Sheet Column Title |
Easy |
|
| 169 |
Majority Element |
Easy |
|
| 170 |
Two Sum III - Data Structure Design |
Easy |
|
| 171 |
Excel Sheet Column Number |
Easy |
|
| 172 |
Factoring Trailing Zeroes |
Easy |
|
| 189 |
Rotate Array |
Easy |
|
| 190 |
Reverse Bits |
Easy |
|
| 191 |
Number of One Bits |
Easy |
|
| 198 |
House Robber |
Easy |
|
| 202 |
Happy Number |
Easy |
|
| 203 |
Remove Linked List Elements |
Easy |
|
| 204 |
Count Primes |
Easy |
|
| 205 |
Isomorphic Strings |
Easy |
|
| 206 |
Reverse Linked Lists |
Easy |
|
| 217 |
Contains Duplicate |
Easy |
|
| 219 |
Contains Duplicate II |
Easy |
|
| 225 |
Implement Stack using Queues |
Easy |
|
| 226 |
Invert Binary Tree |
Easy |
|
| 231 |
Power of Two |
Easy |
|
| 232 |
Implement Queue Using Stacks |
Easy |
|
| 234 |
Palindrome Linked Lists |
Easy |
|
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
Easy |
|
| 237 |
Delete a Node In A Linked List |
Easy |
|
| 242 |
Valid Anagram |
Easy |
|
| 243 |
Shortest Word Distance |
Easy |
|
| 246 |
Strobogramatic Number |
Easy |
|
| 252 |
Meeting Rooms |
Easy |
|
| 256 |
Paint House |
Easy |
|
| 257 |
Binary Tree Paths |
Easy |
|
| 258 |
Add Digits |
Easy |
|
| 263 |
Ugly Number |
Easy |
|
| 266 |
Palindrome Permutation |
Easy |
|
| 268 |
Missing Number |
Easy |
|
| 270 |
Closest Binary Search Tree Value |
Easy |
|
| 276 |
Paint Fence |
Easy |
|
| 278 |
First Bad Version |
Easy |
|
| 283 |
Move Zeroes |
Easy |
|
| 290 |
Word Pattern |
Easy |
|
| 292 |
Nim Game |
Easy |
|
| 293 |
Flip Game |
Easy |
|
| 299 |
Bulls and Cows |
Easy |
|
| 303 |
Range Sum Query - Immutable |
Easy |
|
| 326 |
Power of Three |
Easy |
|
| 339 |
Nested List Weight Sum |
Easy |
|
| 342 |
Power of Four |
Easy |
|
| 344 |
Reverse A String |
Easy |
|
| 345 |
Reverse Vowels of A String |
Easy |
|
| 346 |
Moving Average From Data Stream |
Easy |
|
| 349 |
Intersection of 2 Arrays |
Easy |
|
| 350 |
Intersection of 2 Arrays II |
Easy |
|
| 359 |
Logger Rate Limiter |
Easy |
|
| 367 |
Valid Perfect Square |
Easy |
|
| 374 |
Guess Number Higher or Lower |
Easy |
|
| 383 |
Ransom Note |
Easy |
|
| 387 |
First Unique Character in String |
Easy |
|
| 389 |
Find the Difference |
Easy |
|
| 392 |
Is Subsequence |
Easy |
|
| 401 |
Binary Watch |
Easy |
|
| 404 |
Sum of Left Leaves |
Easy |
|
| 405 |
Convert a Number to Hexadecimal |
Easy |
|
| 408 |
Valid Word Abbreviation |
Easy |
|
| 409 |
Longest Palindrome |
Easy |
|
| 412 |
Fizz Buzz |
Easy |
|
| 414 |
Third Maximum Number |
Easy |
|
| 415 |
Add Strings |
Easy |
|
| 422 |
Valid Word Square |
Easy |
|
| 434 |
Number of Segments in a String |
Easy |
|
| 441 |
Arranging Coins |
Easy |
|
| 443 |
String Compression |
Easy |
|
| 447 |
Number of Boomerangs |
Easy |
|
| 448 |
Find All Numbers Disappeared in an Array |
Easy |
|
| 453 |
Minimum Moves to Equal Array Elements |
Easy |
|
| 455 |
Assign Cookies |
Easy |
|
| 459 |
Repeated Substring Pattern |
Easy |
|
| 461 |
Hamming Distance |
Easy |
|
| 463 |
Island Perimeter |
Easy |
|
| 475 |
Heaters |
Easy |
|
| 476 |
Number Complement |
Easy |
|
| 482 |
License Key Formatting |
Easy |
|
| 485 |
Max Consecutive Ones |
Easy |
|
| 492 |
Construct the Rectangle |
Easy |
|
| 496 |
Next Greater Element I |
Easy |
|
| 500 |
Keyboard Row |
Easy |
|
| 501 |
Find Mode in Binary Search Tree |
Easy |
|
| 504 |
Base 7 |
Easy |
|
| 506 |
Relative Ranks |
Easy |
|
| 507 |
Perfect Number |
Easy |
|
| 509 |
Fibonacci Number |
Easy |
|
| 520 |
Detect Capital |
Easy |
|
| 521 |
Longest Uncommon Subsequence I |
Easy |
|
| 530 |
Minimum Absolute Difference in BST |
Easy |
|
| 532 |
K - Diff Pairs in Array |
Easy |
|
| 538 |
Convert BST to Greater Tree |
Easy |
|
| 541 |
Reverse String II |
Easy |
|
| 543 |
Diameter of Binary Tree |
Easy |
|
| 551 |
Student Attendance Record I |
Easy |
|
| 557 |
Reverse Words in a String III |
Easy |
|
| 559 |
Maximum Depth of N-Ary Tree |
Easy |
|
| 561 |
Array Partition I |
Easy |
|
| 563 |
Binary Tree Tilt |
Easy |
|
| 566 |
Reshape The Matrix |
Easy |
|
| 572 |
Subtree of Another Tree |
Easy |
|
| 575 |
Distribute Candies |
Easy |
|
| 581 |
Shortest Unsorted Continuous Subarray |
Easy |
|
| 589 |
N-Ary Tree Preorder Traversal |
Easy |
|
| 590 |
N-Ary Tree Postorder Traversal |
Easy |
|
| 594 |
Longest Harmonious Subsequence |
Easy |
|
| 598 |
Range Addition II |
Easy |
|
| 599 |
Minimum Index Sum of 2 Lists |
Easy |
|
| 604 |
Design Compressed String Iterator |
Easy |
|
| 605 |
Can Place Flowers |
Easy |
|
| 606 |
Construct String from Binary Tree |
Easy |
|
| 617 |
Merge Two Binary Trees |
Easy |
|
| 624 |
Maximum Distance in Arrays |
Easy |
|
| 628 |
Maximum Product of Three Numbers |
Easy |
|
| 633 |
Sum Square Numbers |
Easy |
|
| 637 |
Average of Levels in Binary Tree |
Easy |
|
| 643 |
Maximum Average SubArray I |
Easy |
|
| 645 |
Set Mismatch |
Easy |
|
| 653 |
Two Sum IV - Input is a BST |
Easy |
|
| 657 |
Robot Return to Origin |
Easy |
|
| 661 |
Image Smoother |
Easy |
|
| 665 |
Non Deceasing Array |
Easy |
|
| 669 |
Trim a Binary Search Tree |
Easy |
|
| 671 |
Second Minimum Node in Binary Tree |
Easy |
|
| 674 |
Longest Continuous Increasing Subsequence |
Easy |
|
| 680 |
Valid Palindrome II |
Easy |
|
| 682 |
Baseball Game |
Easy |
|
| 686 |
Repeated String Match |
Easy |
|
| 687 |
Longest Univalue Path |
Easy |
|
| 690 |
Employee Importance |
Easy |
|
| 693 |
Binary Number with Alternating Bits |
Easy |
|
| 696 |
Count Binary Substrings |
Easy |
|
| 697 |
Degree of an Array |
Easy |
|
| 700 |
Search in a Binary Search Tree |
Easy |
|
| 703 |
Kth Largest Element in a Stream |
Easy |
|
| 704 |
Binary Search |
Easy |
|
| 705 |
Design HashSet |
Easy |
|
| 706 |
Design HashMap |
Easy |
|
| 709 |
To Lower Case |
Easy |
|
| 716 |
Max Stack |
Easy |
|
| 717 |
1-bit and 2-bit Characters |
Easy |
|
| 720 |
Longest Word in Dictionary |
Easy |
|
| 724 |
Find Pivot Index |
Easy |
|
| 728 |
Self Dividing Numbers |
Easy |
|
| 733 |
Flood Fill |
Easy |
|
| 734 |
Sentence Similarity |
Easy |
|
| 744 |
Find Smallest Letter Greater Than Target |
Easy |
|
| 746 |
Min Cost Climbing Stairs |
Easy |
|
| 747 |
Largest Number at least twize of Others |
Easy |
|
| 748 |
Shortest Completing Word |
Easy |
|
| 758 |
Bold Words in String |
Easy |
|
| 760 |
Find Anagram Mappings |
Easy |
|
| 762 |
Prime Number of Set Bits in Primary Representation |
Easy |
|
| 766 |
Toeplitz Matrix |
Easy |
|
| 771 |
Jewels and Stones |
Easy |
|
| 783 |
Minimum Distance Between BST Nodes |
Easy |
|
| 788 |
Rotated Digits |
Easy |
|
| 796 |
Rotate String |
Easy |
|
| 800 |
Similar RGB Color |
Easy |
|
| 804 |
Unique Morse Code Words |
Easy |
|
| 806 |
Number of Lines to Write String |
Easy |
|
| 811 |
Subdomain Visit Count |
Easy |
|
| 812 |
Largest Triangle Area |
Easy |
|
| 819 |
Most Common Word |
Easy |
|
| 821 |
Shortest Distance to Character |
Easy |
|
| 824 |
Goat Latin |
Easy |
|
| 830 |
Positions of Large Groups |
Easy |
|
| 832 |
Flipping an Image |
Easy |
|
| 836 |
Rectangle Overlap |
Easy |
|
| 840 |
Magic Squares in Grid |
Easy |
|
| 844 |
Backspace String Compare |
Easy |
|
| 849 |
Maximize Distance to Closest Person |
Easy |
|
| 852 |
Peak Index in Mountain Array |
Easy |
|
| 859 |
Buddy Strings |
Easy |
|
| 860 |
Lemonade Change |
Easy |
|
| 867 |
Transpose Matrix |
Easy |
|
| 868 |
Binary Gap |
Easy |
|
| 872 |
Leaf-Similar Trees |
Easy |
|
| 874 |
Walking Robot Simulation |
Easy |
|
| 876 |
Middle of the Linked List |
Easy |
|
| 883 |
Projection Area of 3D Shapes |
Easy |
|
| 884 |
Uncommon Words from 2 Sentences |
Easy |
|
| 888 |
Fair Candy Swap |
Easy |
|
| 892 |
Surface Area of 3D Shapes |
Easy |
|
| 893 |
Groups of Special Equivalent Strings |
Easy |
|
| 896 |
Monotonic Array |
Easy |
|
| 897 |
Increasing Order Search Tree |
Easy |
|
| 905 |
Sort Array by Parity |
Easy |
|
| 908 |
Smallest Range I |
Easy |
|
| 914 |
X of a kind in a Deck of Cards |
Easy |
|
| 917 |
Reverse Only Letters |
Easy |
|
| 922 |
Sort Array by Parity II |
Easy |
|
| 925 |
Long Pressed Name |
Easy |
|
| 929 |
Unique Email Addresses |
Easy |
|
| 933 |
Number of Recent Calls |
Easy |
|
| 937 |
Reorder Data In Log Files |
Easy |
|
| 938 |
Range Sum of BST |
Easy |
|
| 941 |
Valid Mountain Array |
Easy |
|
| 942 |
DI String Match |
Easy |
|
| 944 |
Delete Columns to Make Sorted |
Easy |
|
| 949 |
Largest Time for Given Digits |
Easy |
|
| 953 |
Verifying an Alien Dictionary |
Easy |
|
| 961 |
N-Repeated Elements in Size 2N Array |
Easy |
|
| 965 |
Univalued Binary Tree |
Easy |
|
| 970 |
Powerful Integers |
Easy |
|
| 976 |
Largest Perimeter Triangle |
Easy |
|
| 977 |
Squares of a Sorted Array |
Easy |
|
| 985 |
Sum of Even Numbers after Queries |
Easy |
|
| 989 |
Add to Array Form of Integer |
Easy |
|
| 993 |
Cousins in Binary Tree |
Easy |
|
| 997 |
Find the Town Judge |
Easy |
|
| 999 |
Available Captures for Rook |
Easy |
|
| 1002 |
Find Common Characters |
Easy |
|
| 1005 |
Maximize Sum of Array After K Negations |
Easy |
|
| 1009 |
Complement of Base 10 Integer |
Easy |
|
| 1010 |
Pairs of Songs With Total Durations Divisible by 60 |
Easy |
|
| 1013 |
Partition Array into Three Parts with equal Sum |
Easy |
|
| 1018 |
Binary Prefix Divisible by 5 |
Easy |
|
| 1021 |
Remove Outermost Parenthesis |
Easy |
|
| 1022 |
Sum of Root to Leaf Binary Numbers |
Easy |
|
| 1025 |
Divisor Game |
Easy |
|
| 1029 |
Two City Scheduling |
Easy |
|
| 1030 |
Matrix Cells in Distance Order |
Easy |
|
| 1033 |
Moving Stones Until Consecutive |
Easy |
|
| 1037 |
Valid Boomerang |
Easy |
|
| 1042 |
Flower Planting with no Adjacent |
Easy |
|
| 1046 |
Last Stone Weight |
Easy |
|
| 1047 |
Remove All adjacent Duplicates in String |
Easy |
|
| 1051 |
Height Checker |
Easy |
|
| 1056 |
Confusing Number |
Easy |
|
| 1064 |
Fixed Point |
Easy |
|
| 1065 |
Index Pairs of a String |
Easy |
|
| 1071 |
Greatest Common Divisors of Strings |
Easy |
|
| 1078 |
Occurrence After Bigram |
Easy |
|
| 1085 |
Sum of Digits in Minimum Number |
Easy |
|
| 1086 |
High Five |
Easy |
|
| 1089 |
Duplicate Zeroes |
Easy |
|
| 1099 |
Two Sum Less Than K |
Easy |
|
| 1103 |
Distribute Candies to People |
Easy |
|
| 1108 |
Defanging an IP Address |
Easy |
|
| 1118 |
Number of Days in a Month |
Easy |
|
| 1119 |
Remove Vowels From String |
Easy |
|
| 1122 |
Relative Sort Array |
Easy |
|
| 1128 |
Number of Equivalent Domino Pairs |
Easy |
|
| 1133 |
Largest Unique Number |
Easy |
|
| 1134 |
Armstrong Number |
Easy |
|
| 1137 |
Nth Tribonacci Number |
Easy |
|
| 1150 |
Check if Number is Majority Element in Sorted Array |
Easy |
|
| 1154 |
Day of The Year |
Easy |
|
| 1160 |
Find Words That Can Be Formed By Characters |
Easy |
|
| 1165 |
Single Row Keyboard |
Easy |
|
| 1170 |
Compare Strings By Frequency of the Smallest Character |
Easy |
|
| 1175 |
Prime Arrangements |
Easy |
|
| 1176 |
Diet Plan Performance |
Easy |
|
| 1180 |
Count Substrings with only one Distinct Letter |
Easy |
|
| 1184 |
Distance Between Bus Stops |
Easy |
|
| 1185 |
Day of the Week |
Easy |
|
| 1189 |
Maximum Number of Balloons |
Easy |
|
| 1196 |
How Many Apples Can You Put into the Basket |
Easy |
|
| 1200 |
Minimum Absolute Difference |
Easy |
|
| 1207 |
Unique Number of Occurrences |
Easy |
|
| 1213 |
Intersection of Three Sorted Arrays |
Easy |
|
| 1217 |
Play With Chips |
Easy |
|
| 1221 |
Split A String In Balanced Strings |
Easy |
|
| 1228 |
Missing A Number In Arithmetic Progression |
Easy |
|
| 1232 |
Check If It Is A Straight Line |
Easy |
|
| 1237 |
Find Positive Integer Solutions for a Given Equation |
Easy |
|
| 1243 |
Array Transformation |
Easy |
|
| 1252 |
Cells With Odd Values In Matrix |
Easy |
|
| 1260 |
Shift 2D Grid |
Easy |
|
| 1266 |
Minimum Time Visiting All Points |
Easy |
|
| 1271 |
Hexspeak |
Easy |
|
| 1275 |
Find Winner On a Tic Tac Toe Game |
Easy |
|
| 1281 |
Subtract the Product and Sum of Digits of a Integer |
Easy |
|
| 1287 |
Element Appearing More Than 25% in Sorted Array |
Easy |
|
| 1290 |
Convert Binary Number In A Linked List to Integer |
Easy |
|
| 1295 |
Find Numbers With Even Numbers of Digits |
Easy |
|
| 1299 |
Replace Elements With Greatest Element on Right Side |
Easy |
|
| 1304 |
Find N Unique Integers Sum Up To Zero |
Easy |
|
| 1309 |
Decrypt String From Alphabet To Integer Mapping |
Easy |
|
| 1313 |
Decompress Run-Length Encoded Strings |
Easy |
|
| 1317 |
Convert Integer to Sum Of Two Non-Zero Integers |
Easy |
|
| 1323 |
Maximum 69 Number |
Easy |
|
| 1331 |
Rank Transform of An Array |
Easy |
|
| 1332 |
Remove Palindromic Subsequences |
Easy |
|
| 1337 |
The K Weakest Rows In A Matrix |
Easy |
|
| 1342 |
Number of Steps to Reduce a Number to Zero |
Easy |
|
| 1346 |
Check if N and It's Double Exist |
Easy |
|
| 1351 |
Count Negative Numbers In A Sorted Matrix |
Easy |
|
| 1356 |
Sort Integers by Number of 1 Bits |
Easy |
|
| 1360 |
Number of Days Between Two Dates |
Easy |
|
| 1365 |
How Many Numbers Are Smaller Than Current Number |
Easy |
|
| 1370 |
Increasing Decreasing String |
Easy |
|
| 1374 |
Generate A String With Characters That Have Odd Count |
Easy |
|
| 1380 |
Lucky Numbers In A Matrix |
Easy |
|
| 1385 |
Find The Distance Value Between 2 Arrays |
Easy |
|
| 1389 |
Create Target Array in Given Order |
Easy |
|
| 1394 |
Find Lucky Integer In An Array |
Easy |
|
| 1399 |
Count Largest Group |
Easy |
|
| 1403 |
Minimum Subsequence in Non-Increasing Order |
Easy |
|
| 1408 |
String Matching In An Array |
Easy |
|
| 1413 |
Minimum Value To Get Positive Step By Step Sum |
Easy |
|
| 1417 |
Reformat The String |
Easy |
|
| 1422 |
Maximum Score After Splitting A String |
Easy |
|
| 1426 |
Counting Elements |
Easy |
|
| 1427 |
Performing String Shifts |
Easy |
|
| 1431 |
Kids With The Greatest Number Of Candies |
Easy |
|
| 1436 |
Destination City |
Easy |
|
| 1441 |
Build An Array With Stack Operation |
Easy |
|
| 1446 |
Consecutive Characters |
Easy |
|
| 1450 |
Number of Students Doing Homework at Given Time |
Easy |
|
| 1455 |
Check If Word Occurs as Prefix of any Word in Sentence |
Easy |
|
| 1460 |
Make 2 Arrays Equal by Reversing Sub Arrays |
Easy |
|
| 1464 |
Maximum Product of 2 Elements in Array |
Easy |
|
| 1469 |
Find All Lonely Nodes |
Easy |
|
| 1470 |
Shuffle The Array |
Easy |
|
| 1474 |
Delete N Nodes After M Nodes In A Linked List |
Easy |
|
| 1475 |
Final Prices With Special Discount in a Shop |
Easy |
|
| 1480 |
Running Sum of 1D Array |
Easy |
|
| 1486 |
XOR Operations in An Array |
Easy |
|
| 1491 |
Average Salary Excluding the Minimum and Maximum Salary |
Easy |
|
| 1496 |
Path Crossing |
Easy |
|
| 1502 |
Can Make Arithmetic Progression From Sequence |
Easy |
|
| 1507 |
Reformat Date |
Easy |
|
| 1512 |
Number of Good Pairs |
Easy |
|
| 1518 |
Water Bottles |
Easy |
|
| 1523 |
Count Odd Numbers In Interval Range |
Easy |
|
| 1528 |
Shuffle Strings |
Easy |
|
| 1534 |
Count Good Triplets |
Easy |
|
| 1539 |
Kth Missing Positive Number |
Easy |
|
| 1544 |
Make The String Great |
Easy |
|
Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
