| 1 |
1-bit and 2-bit Characters |
| 2 |
A Number After a Double Reversal |
| 3 |
Add Binary |
| 4 |
Add Digits |
| 5 |
Add Strings |
| 6 |
Add to Array-Form of Integer |
| 7 |
Alternating Digit Sum |
| 8 |
Apply Operations to an Array |
| 9 |
Armstrong Number |
| 10 |
Arranging Coins |
| 11 |
Array Partition I |
| 12 |
Array Transformation |
| 13 |
Assign Cookies |
| 14 |
Available Captures for Rook |
| 15 |
Average Salary Excluding the Minimum and Maximum Salary |
| 16 |
Average Value of Even Numbers That Are Divisible by Three |
| 17 |
Average of Levels in Binary Tree |
| 18 |
Backspace String Compare |
| 19 |
Balanced Binary Tree |
| 20 |
Base 7 |
| 21 |
Baseball Game |
| 22 |
Best Poker Hand |
| 23 |
Best Time to Buy and Sell Stock |
| 24 |
Binary Gap |
| 25 |
Binary Number with Alternating Bits |
| 26 |
Binary Prefix Divisible By 5 |
| 27 |
Binary Search |
| 28 |
Binary Tree Inorder Traversal |
| 29 |
Binary Tree Level Order Traversal II |
| 30 |
Binary Tree Paths |
| 31 |
Binary Tree Postorder Traversal |
| 32 |
Binary Tree Tilt |
| 33 |
Binary Watch |
| 34 |
Buddy Strings |
| 35 |
Build Array from Permutation |
| 36 |
Build an Array With Stack Operations |
| 37 |
Bulls and Cows |
| 38 |
Calculate Amount Paid in Taxes |
| 39 |
Calculate Delayed Arrival Time |
| 40 |
Calculate Digit Sum of a String |
| 41 |
Calculate Money in Leetcode Bank |
| 42 |
Can Make Arithmetic Progression From Sequence |
| 43 |
Can Place Flowers |
| 44 |
Capitalize the Title |
| 45 |
Categorize Box According to Criteria |
| 46 |
Cells in a Range on an Excel Sheet |
| 47 |
Cells with Odd Values in a Matrix |
| 48 |
Check Array Formation Through Concatenation |
| 49 |
Check Distances Between Same Letters |
| 50 |
Check If It Is a Straight Line |
| 51 |
Check If N and Its Double Exist |
| 52 |
Check If String Is a Prefix of Array |
| 53 |
Check If Two String Arrays are Equivalent |
| 54 |
Check If a Number Is Majority Element in a Sorted Array |
| 55 |
Check If a Word Occurs As a Prefix of Any Word in a Sentence |
| 56 |
Check Whether Two Strings are Almost Equivalent |
| 57 |
Check if All A's Appears Before All B's |
| 58 |
Check if All Characters Have Equal Number of Occurrences |
| 59 |
Check if All the Integers in a Range Are Covered |
| 60 |
Check if Array Is Sorted and Rotated |
| 61 |
Check if Binary String Has at Most One Segment of Ones |
| 62 |
Check if Every Row and Column Contains All Numbers |
| 63 |
Check if Matrix Is X-Matrix |
| 64 |
Check if Number Has Equal Digit Count and Digit Value |
| 65 |
Check if Numbers Are Ascending in a Sentence |
| 66 |
Check if One String Swap Can Make Strings Equal |
| 67 |
Check if String Is Decomposable Into Value-Equal Substrings |
| 68 |
Check if Word Equals Summation of Two Words |
| 69 |
Check if an Array Is Consecutive |
| 70 |
Check if the Sentence Is Pangram |
| 71 |
Circular Sentence |
| 72 |
Climbing Stairs |
| 73 |
Closest Binary Search Tree Value |
| 74 |
Compare Strings by Frequency of the Smallest Character |
| 75 |
Complement of Base 10 Integer |
| 76 |
Concatenation of Array |
| 77 |
Confusing Number |
| 78 |
Consecutive Characters |
| 79 |
Construct String from Binary Tree |
| 80 |
Construct the rectangle |
| 81 |
Contains Duplicate II |
| 82 |
Contains Duplicate |
| 83 |
Convert 1D Array Into 2D Array |
| 84 |
Convert BST to Greater Tree |
| 85 |
Convert Binary Number in a Linked List to Integer |
| 86 |
Convert Sorted Array To Binary Search Tree |
| 87 |
Convert a number to hexadecimal |
| 88 |
Convert the Temperature |
| 89 |
Count Asterisks |
| 90 |
Count Binary Substrings |
| 91 |
Count Common Words With One Occurrence |
| 92 |
Count Distinct Numbers on Board |
| 93 |
Count Elements With Strictly Smaller and Greater Elements |
| 94 |
Count Equal and Divisible Pairs in an Array |
| 95 |
Count Good Triplets |
| 96 |
Count Hills and Valleys in an Array |
| 97 |
Count Integers With Even Digit Sum |
| 98 |
Count Items Matching a Rule |
| 99 |
Count Largest Group |
| 100 |
Count Negative Numbers in a Sorted Matrix |
| 101 |
Count Number of Pairs With Absolute Difference K |
| 102 |
Count Odd Numbers in an Interval Range |
| 103 |
Count Operations to Obtain Zero |
| 104 |
Count Pairs Of Similar Strings |
| 105 |
Count Prefixes of a Given String |
| 106 |
Count Primes |
| 107 |
Count Special Quadruplets |
| 108 |
Count Square Sum Triples |
| 109 |
Count Substrings with Only One Distinct Letter |
| 110 |
Count Vowel Substrings of a String |
| 111 |
Count of Matches in Tournament |
| 112 |
Count the Digits That Divide a Number |
| 113 |
Count the Number of Consistent Strings |
| 114 |
Count the Number of Vowel Strings in Range |
| 115 |
Counting Bits |
| 116 |
Counting Elements |
| 117 |
Counting Words With a Given Prefix |
| 118 |
Cousins in Binary Tree |
| 119 |
Crawler Log Folder |
| 120 |
Create Target Array in the Given Order |
| 121 |
DI String Match |
| 122 |
Day of the Week |
| 123 |
Day of the Year |
| 124 |
Decode XORed Array |
| 125 |
Decode the Message |
| 126 |
Decompress Run-Length Encoded List |
| 127 |
Decrypt String from Alphabet to Integer Mapping |
| 128 |
Defanging an IP Address |
| 129 |
Defuse the Bomb |
| 130 |
Degree of an array |
| 131 |
Delete Characters to Make Fancy String |
| 132 |
Delete Columns to Make Sorted |
| 133 |
Delete N Nodes After M Nodes of a Linked List |
| 134 |
Delete Node in a Linked List |
| 135 |
Design Compressed String Iterator |
| 136 |
Design HashMap |
| 137 |
Design HashSet |
| 138 |
Design Linked List |
| 139 |
Design Parking System |
| 140 |
Design an Ordered Stream |
| 141 |
Design an Ordered System |
| 142 |
Destination City |
| 143 |
Detect Capital |
| 144 |
Detect Pattern of Length M Repeated K or More Times |
| 145 |
Determine Color of a Chessboard Square |
| 146 |
Determine Whether Matrix Can Be Obtained By Rotation |
| 147 |
Determine if String Halves Are Alike |
| 148 |
Determine if Two Events Have Conflict |
| 149 |
Diameter of Binary Tree |
| 150 |
Diet Plan Performance |
| 151 |
Difference Between Element Sum and Digit Sum of an Array |
| 152 |
Distance Between Bus Stops |
| 153 |
Distribute Candies to People |
| 154 |
Distribute Candies |
| 155 |
Distribute Money to Maximum Children |
| 156 |
Divide Array Into Equal Pairs |
| 157 |
Divide a String Into Groups of Size k |
| 158 |
Divisor Game |
| 159 |
Duplicate Zeros |
| 160 |
Element Appearing More Than 25% In Sorted Array |
| 161 |
Employee Importance |
| 162 |
Evaluate Boolean Binary Tree |
| 163 |
Excel Sheet Column Number |
| 164 |
Excel Sheet Column Title |
| 165 |
Factorial Trailing Zeroes |
| 166 |
Fair Candy Swap |
| 167 |
Fibonacci Number |
| 168 |
Final Prices With a Special Discount in a Shop |
| 169 |
Final Value of Variable After Performing Operations |
| 170 |
Find All K-Distant Indices in an Array |
| 171 |
Find All Numbers Disappeared in an Array |
| 172 |
Find All the Lonely Nodes |
| 173 |
Find Anagram Mappings |
| 174 |
Find Closest Number to Zero |
| 175 |
Find Common Characters |
| 176 |
Find First Palindromic String in the Array |
| 177 |
Find Greatest Common Divisor of Array |
| 178 |
Find Lucky Integer in an Array |
| 179 |
Find Mode in Binary Search Tree |
| 180 |
Find N Unique Integers Sum up to Zero |
| 181 |
Find Nearest Point That Has the Same X or Y Coordinate |
| 182 |
Find Numbers with Even Number of Digits |
| 183 |
Find Pivot Index |
| 184 |
Find Positive Integer Solution for a Given Equation |
| 185 |
Find Resultant Array After Removing Anagrams |
| 186 |
Find Smallest Letter Greater Than Target |
| 187 |
Find Subarrays With Equal Sum |
| 188 |
Find Target Indices After Sorting Array |
| 189 |
Find Winner on a Tic Tac Toe Game |
| 190 |
Find Words That Can Be Formed by Characters |
| 191 |
Find if Path Exists in Graph |
| 192 |
Find the Array Concatenation Value |
| 193 |
Find the Difference of Two Arrays |
| 194 |
Find the Distance Value Between Two Arrays |
| 195 |
Find the Highest Altitude |
| 196 |
Find the K-Beauty of a Number |
| 197 |
Find the Longest Balanced Substring of a Binary String |
| 198 |
Find the Middle Index in Array |
| 199 |
Find the Town Judge |
| 200 |
Find the Width of Columns of a Grid |
| 201 |
Find the difference |
| 202 |
Finding 3-Digit Even Numbers |
| 203 |
First Bad Version |
| 204 |
First Letter to Appear Twice |
| 205 |
First Unique Character in a String |
| 206 |
Fixed Point |
| 207 |
Fizz Buzz |
| 208 |
Flip Game |
| 209 |
Flipping an Image |
| 210 |
Flood Fill |
| 211 |
Flower Planting With No Adjacent |
| 212 |
Form Smallest Number From Two Digit Arrays |
| 213 |
Generate a String With Characters That Have Odd Counts |
| 214 |
Get Maximum in Generated Array |
| 215 |
Goal Parser Interpretation |
| 216 |
Goat Latin |
| 217 |
Greatest Common Divisor of Strings |
| 218 |
Greatest English Letter in Upper and Lower Case |
| 219 |
Groups of Special-Equivalent Strings |
| 220 |
Guess Number Higher or Lower |
| 221 |
Hamming Distance |
| 222 |
Happy Number |
| 223 |
Heaters |
| 224 |
Height Checker |
| 225 |
Hexspeak |
| 226 |
High Five |
| 227 |
How Many Apples Can You Put into the Basket |
| 228 |
How Many Numbers Are Smaller Than the Current Number |
| 229 |
Image Smoother |
| 230 |
Implement Queue using Stacks |
| 231 |
Implement Stack using Queues |
| 232 |
Implement strStr |
| 233 |
Increasing Decreasing String |
| 234 |
Increasing Order Search Tree |
| 235 |
Index Pairs of a String |
| 236 |
Intersection of Multiple Arrays |
| 237 |
Intersection of Three Sorted Arrays |
| 238 |
Intersection of Two Arrays II |
| 239 |
Intersection of Two Arrays |
| 240 |
Intersection of two Linked Lists |
| 241 |
Invert Binary Tree |
| 242 |
Is Subsequence |
| 243 |
Island Perimeter |
| 244 |
Isomorphic Strings |
| 245 |
Jewels and Stones |
| 246 |
Judge Route Cycle |
| 247 |
K Items With the Maximum Sum |
| 248 |
K-diff Pairs in an Array |
| 249 |
Keep Multiplying Found Values by Two |
| 250 |
Keyboard Row |
| 251 |
Kids With the Greatest Number of Candies |
| 252 |
Kth Distinct String in an Array |
| 253 |
Kth Largest Element in a Stream |
| 254 |
Kth Missing Positive Number |
| 255 |
Largest 3-Same-Digit Number in String |
| 256 |
Largest Local Values in a Matrix |
| 257 |
Largest Number After Digit Swaps by Parity |
| 258 |
Largest Number At Least Twice of Others |
| 259 |
Largest Odd Number in String |
| 260 |
Largest Perimeter Triangle |
| 261 |
Largest Positive Integer That Exists With Its Negative |
| 262 |
Largest Substring Between Two Equal Characters |
| 263 |
Largest Triangle Area |
| 264 |
Largest Unique Number |
| 265 |
Last Stone Weight |
| 266 |
Latest Time by Replacing Hidden Digits |
| 267 |
Leaf-Similar Trees |
| 268 |
Left and Right Sum Differences |
| 269 |
Lemonade Change |
| 270 |
Length of last word |
| 271 |
Letter Case Permutation |
| 272 |
License Key Formatting |
| 273 |
Linked List Cycle |
| 274 |
Logger Rate Limiter |
| 275 |
Long Pressed Name |
| 276 |
Longer Contiguous Segments of Ones than Zeros |
| 277 |
Longest Common Prefix |
| 278 |
Longest Continuous Increasing Subsequence |
| 279 |
Longest Harmonious Subsequence |
| 280 |
Longest Nice Substring |
| 281 |
Longest Palindrome |
| 282 |
Longest Subsequence With Limited Sum |
| 283 |
Longest Uncommon Subsequence |
| 284 |
Longest Univalue Path |
| 285 |
Longest Word in Dictionary |
| 286 |
Lowest Common Ancestor of a Binary Search Tree |
| 287 |
Lucky Numbers in a Matrix |
| 288 |
Magic Squares In Grid |
| 289 |
Majority Element |
| 290 |
Make Array Zero by Subtracting Equal Amounts |
| 291 |
Make The String Great |
| 292 |
Matrix Cells in Distance Order |
| 293 |
Matrix Diagonal Sum |
| 294 |
Max Consecutive Ones |
| 295 |
Maximize Sum Of Array After K Negations |
| 296 |
Maximum 69 Number |
| 297 |
Maximum Ascending Subarray Sum |
| 298 |
Maximum Average Subarray I |
| 299 |
Maximum Count of Positive Integer and Negative Integer |
| 300 |
Maximum Depth of N-ary Tree |
| 301 |
Maximum Difference Between Increasing Elements |
| 302 |
Maximum Difference by Remapping a Digit |
| 303 |
Maximum Distance in Arrays |
| 304 |
Maximum Enemy Forts That Can Be Captured |
| 305 |
Maximum Nesting Depth of the Parentheses |
| 306 |
Maximum Number of Balloons |
| 307 |
Maximum Number of Balls in a Box |
| 308 |
Maximum Number of Pairs in Array |
| 309 |
Maximum Number of Words Found in Sentences |
| 310 |
Maximum Number of Words You Can Type |
| 311 |
Maximum Population Year |
| 312 |
Maximum Product Difference Between Two Pairs |
| 313 |
Maximum Product of Three Numbers |
| 314 |
Maximum Product of Two Elements in an Array |
| 315 |
Maximum Repeating Substring |
| 316 |
Maximum Subarray Sum I |
| 317 |
Maximum Sum With Exactly K Elements |
| 318 |
Maximum Units on a Truck |
| 319 |
Maximum Value of a String in an Array |
| 320 |
Maximum depth of Binary tree |
| 321 |
Mean of Array After Removing Some Elements |
| 322 |
Meeting Rooms |
| 323 |
Merge Similar Items |
| 324 |
Merge Sorted Array |
| 325 |
Merge Strings Alternately |
| 326 |
Merge Two 2D Arrays by Summing Values |
| 327 |
Merge Two Sorted Lists |
| 328 |
Merge two binary trees |
| 329 |
Middle of the linked list |
| 330 |
Min Cost Climbing Stairs |
| 331 |
Min Max Game |
| 332 |
Minimum Absolute Difference in BST |
| 333 |
Minimum Absolute Difference |
| 334 |
Minimum Amount of Time to Fill Cups |
| 335 |
Minimum Bit Flips to Convert Number |
| 336 |
Minimum Changes To Make Alternating Binary String |
| 337 |
Minimum Common Value |
| 338 |
Minimum Cost of Buying Candies With Discount |
| 339 |
Minimum Cost to Move Chips to The Same Position |
| 340 |
Minimum Cuts to Divide a Circle |
| 341 |
Minimum Depth of a Binary Tree |
| 342 |
Minimum Difference Between Highest and Lowest of K Scores |
| 343 |
Minimum Distance Between BST Nodes |
| 344 |
Minimum Distance to the Target Element |
| 345 |
Minimum Hours of Training to Win a Competition |
| 346 |
Minimum Index Sum of Two Lists |
| 347 |
Minimum Moves to Convert String |
| 348 |
Minimum Moves to Equal an Array Element |
| 349 |
Minimum Number of Moves to Seat Everyone |
| 350 |
Minimum Number of Operations to Convert Time |
| 351 |
Minimum Operations to Make the Array Increasing |
| 352 |
Minimum Recolors to Get K Consecutive Black Blocks |
| 353 |
Minimum Subsequence in Non-Increasing Order |
| 354 |
Minimum Sum of Four Digit Number After Splitting Digits |
| 355 |
Minimum Time Visiting All Points |
| 356 |
Minimum Time to Type Word Using Special Typewriter |
| 357 |
Minimum Value to Get Positive Step by Step Sum |
| 358 |
Minimum_index_sum_of_two_lists |
| 359 |
Missing Number In Arithmetic Progression |
| 360 |
Missing Number |
| 361 |
Missing Ranges |
| 362 |
Monotonic Array |
| 363 |
Most Common Word |
| 364 |
Most Frequent Even Element |
| 365 |
Most Frequent Number Following Key In an Array |
| 366 |
Most Visited Sector in a Circular Track |
| 367 |
Move Zeroes |
| 368 |
Moving Average from Data Stream |
| 369 |
N-Repeated Element in Size 2N Array |
| 370 |
N-ary Tree Postorder Traversal |
| 371 |
N-ary Tree Preorder Traversal |
| 372 |
N-th Tribonacci Number |
| 373 |
Nested List Weight Sum |
| 374 |
Next Greater Element I |
| 375 |
Next Greater Element |
| 376 |
Nim Game |
| 377 |
Number Complement |
| 378 |
Number Of Rectangles That Can Form The Largest Square |
| 379 |
Number of 1 bits |
| 380 |
Number of Arithmetic Triplets |
| 381 |
Number of Boomerangs |
| 382 |
Number of Common Factors |
| 383 |
Number of Days Between Two Dates |
| 384 |
Number of Days in a Month |
| 385 |
Number of Different Integers in a String |
| 386 |
Number of Distinct Averages |
| 387 |
Number of Equivalent Domino Pairs |
| 388 |
Number of Good Pairs |
| 389 |
Number of Lines To Write String |
| 390 |
Number of Recent Calls |
| 391 |
Number of Steps to Reduce a Number to Zero |
| 392 |
Number of Strings That Appear as Substrings in Word |
| 393 |
Number of Students Doing Homework at a Given Time |
| 394 |
Number of Students Unable to Eat Lunch |
| 395 |
Number of Unequal Triplets in Array |
| 396 |
Number of Valid Words in a Sentence |
| 397 |
Number of segments in a String |
| 398 |
Occurrences After Bigram |
| 399 |
Odd String Difference |
| 400 |
Paint Fence |
| 401 |
Paint House |
| 402 |
Pairs of Songs With Total Durations Divisible by 60 |
| 403 |
Palindrome Linked List |
| 404 |
Palindrome Number |
| 405 |
Palindrome Permutation |
| 406 |
Partition Array Into Three Parts With Equal Sum |
| 407 |
Pascal's Triangle II |
| 408 |
Pascal's Triangle |
| 409 |
Pass the Pillow |
| 410 |
Path Crossing |
| 411 |
Path In Zigzag Labelled Binary Tree |
| 412 |
Path Sum |
| 413 |
Peak Index in a Mountain Array |
| 414 |
Percentage of Letter in String |
| 415 |
Perfect Number |
| 416 |
Perform String Shifts |
| 417 |
Plus One |
| 418 |
Positions of Large Groups |
| 419 |
Power of Four |
| 420 |
Power of Three |
| 421 |
Power of Two |
| 422 |
Powerful Integers |
| 423 |
Prime In Diagonal |
| 424 |
Projection Area of 3D Shapes |
| 425 |
Range Sum Query Immutable |
| 426 |
Range Sum of BST |
| 427 |
Rank Transform of an Array |
| 428 |
Ransom Note |
| 429 |
Read N characters Given Read4 |
| 430 |
Rearrange Characters to Make Target String |
| 431 |
Rearrange Spaces Between Words |
| 432 |
Rectangle Overlap |
| 433 |
Redistribute Characters to Make All Strings Equal |
| 434 |
Reformat Date |
| 435 |
Reformat Phone Number |
| 436 |
Reformat The String |
| 437 |
Relative Sort Array |
| 438 |
Relative ranks |
| 439 |
Remove All Adjacent Duplicates In String |
| 440 |
Remove Digit From Number to Maximize Result |
| 441 |
Remove Duplicates From Sorted Lists |
| 442 |
Remove Duplicates from Sorted Array |
| 443 |
Remove Element |
| 444 |
Remove Letter To Equalize Frequency |
| 445 |
Remove Linked List Elements |
| 446 |
Remove One Element to Make the Array Strictly Increasing |
| 447 |
Remove Outermost Parentheses |
| 448 |
Remove Palindromic Subsequences |
| 449 |
Remove Vowels from a String |
| 450 |
Repeated String Match |
| 451 |
Repeated Substring Pattern |
| 452 |
Replace All ?'s to Avoid Consecutive Repeating Characters |
| 453 |
Replace All Digits with Characters |
| 454 |
Replace Elements with Greatest Element on Right Side |
| 455 |
Reshape the matrix |
| 456 |
Reverse Bits |
| 457 |
Reverse Linked List |
| 458 |
Reverse Only Letters |
| 459 |
Reverse Prefix of Word |
| 460 |
Reverse String II |
| 461 |
Reverse String |
| 462 |
Reverse Vowels of a String |
| 463 |
Reverse words in a String III |
| 464 |
Richest Customer Wealth |
| 465 |
Rings and Rods |
| 466 |
Robot Return to Origin |
| 467 |
Roman to Integer |
| 468 |
Root Equals Sum of Children |
| 469 |
Rotate String |
| 470 |
Row With Maximum Ones |
| 471 |
Running Sum of 1d Array |
| 472 |
Same Tree |
| 473 |
Search Insert Position |
| 474 |
Search in a Binary Search Tree |
| 475 |
Second Largest Digit in a String |
| 476 |
Second Minimum Node in a binary tree |
| 477 |
Self Dividing Number |
| 478 |
Sentence Similarity |
| 479 |
Separate the Digits in an Array |
| 480 |
Set Mismatch |
| 481 |
Shortest Completing Word |
| 482 |
Shortest Distance to Target String in a Circular Array |
| 483 |
Shortest Distance to a Character |
| 484 |
Shortest Word Distance |
| 485 |
Shuffle String |
| 486 |
Shuffle the Array |
| 487 |
Sign of the Product of an Array |
| 488 |
Similar RGB Color |
| 489 |
Single Number |
| 490 |
Single-Row Keyboard |
| 491 |
Slowest Key |
| 492 |
Smallest Even Multiple |
| 493 |
Smallest Index With Equal Value |
| 494 |
Smallest Range I |
| 495 |
Sort Array By Parity II |
| 496 |
Sort Array By Parity |
| 497 |
Sort Array by Increasing Frequency |
| 498 |
Sort Even and Odd Indices Independently |
| 499 |
Sort Integers by The Number of 1 Bits |
| 500 |
Sort the People |
| 501 |
Sorting the Sentence |
| 502 |
Special Array With X Elements Greater Than or Equal X |
| 503 |
Special Positions in a Binary Matrix |
| 504 |
Split With Minimum Sum |
| 505 |
Split a String in Balanced Strings |
| 506 |
SqrtX |
| 507 |
Squares of a Sorted Array |
| 508 |
String Matching in an Array |
| 509 |
String Without AAA or BBB |
| 510 |
Strobogrammatic Number |
| 511 |
Strong Password Checker II |
| 512 |
Student Attendance Record I |
| 513 |
Submission Detail |
| 514 |
Substrings of Size Three with Distinct Characters |
| 515 |
Subtract the Product and Sum of Digits of an Integer |
| 516 |
Subtree of Another Tree |
| 517 |
Sum Of Two Integers |
| 518 |
Sum of All Odd Length Subarrays |
| 519 |
Sum of Digits in Base K |
| 520 |
Sum of Digits in the Minimum Number |
| 521 |
Sum of Digits of String After Convert |
| 522 |
Sum of Left Leaves |
| 523 |
Sum of Root To Leaf Binary Numbers |
| 524 |
Sum of Square Numbers |
| 525 |
Sum of Unique Elements |
| 526 |
Summary Ranges |
| 527 |
Symmetric Tree |
| 528 |
Take Gifts From the Richest Pile |
| 529 |
Teemo Attacking |
| 530 |
Teoplitz Matrix |
| 531 |
The Employee That Worked on the Longest Task |
| 532 |
The K Weakest Rows in a Matrix |
| 533 |
Third Maximum Number |
| 534 |
Thousand Separator |
| 535 |
Three Consecutive Odds |
| 536 |
Three Divisors |
| 537 |
Time Needed to Buy Tickets |
| 538 |
To Lower Case |
| 539 |
Toeplitz Matrix |
| 540 |
Transpose Matrix |
| 541 |
Truncate Sentence |
| 542 |
Two Furthest Houses With Different Colors |
| 543 |
Two Out of Three |
| 544 |
Two Sum III - Data Structure Design |
| 545 |
Two Sum IV - Input is a BST |
| 546 |
Two Sum Less Than K |
| 547 |
Two Sum |
| 548 |
Ugly Number |
| 549 |
Uncommon Words from Two Sentences |
| 550 |
Unique Email Addresses |
| 551 |
Unique Morse Code Words |
| 552 |
Unique Number of Occurrences |
| 553 |
Univalued Binary Tree |
| 554 |
Valid Anagram |
| 555 |
Valid Boomerang |
| 556 |
Valid Mountain Array |
| 557 |
Valid Palindrome II |
| 558 |
Valid Palindrome |
| 559 |
Valid Parentheses |
| 560 |
Valid Perfect Square |
| 561 |
Valid Word Abbreviation |
| 562 |
Valid Word Sequence |
| 563 |
Valid Word Square |
| 564 |
Verifying an Alien Dictionary |
| 565 |
Water Bottles |
| 566 |
Word Pattern |
| 567 |
X of a Kind in a Deck of Cards |
| 568 |
XOR Operation in an Array |
| 569 |
nim_game |
| 570 |
range_addition_II |
| 571 |
trailing_zeroes |