| Reverse Integer |
简单 |
| Integer to Roman |
中等 |
| Roman to Integer |
简单 |
| Divide Two Integers |
中等 |
| Multiply Strings |
中等 |
| Pow(x, n) |
中等 |
| Permutation Sequence |
中等 |
| Valid Number |
困难 |
| Plus One |
简单 |
| Add Binary |
简单 |
| Sqrt(x) |
简单 |
| Max Points on a Line |
困难 |
| Power of Two |
简单 |
| Integer to English Words |
困难 |
| Self Crossing |
困难 |
| Count Numbers with Unique Digits |
中等 |
| Super Pow |
中等 |
| Rotate Function |
中等 |
| Integer Replacement |
中等 |
| Nth Digit |
简单 |
| Encode and Decode TinyURL |
中等 |
| Arithmetic Slices |
中等 |
| Arranging Coins |
简单 |
| Add Strings |
简单 |
| Reconstruct Original Digits from English |
中等 |
| Minimum Moves to Equal Array Elements |
简单 |
| Minimum Moves to Equal Array Elements II |
中等 |
| Maximum Product of Three Numbers |
简单 |
| Continuous Subarray Sum |
中等 |
| Smallest Good Base |
困难 |
| Perfect Number |
简单 |
| Super Washing Machines |
困难 |
| Complex Number Multiplication |
中等 |
| Optimal Division |
中等 |
| Valid Square |
中等 |
| Fraction Addition and Subtraction |
中等 |
| Range Addition II |
简单 |
| Sum of Square Numbers |
简单 |
| Solve the Equation |
中等 |
| Set Mismatch |
简单 |
| Maximum Swap |
中等 |
| Bulb Switcher II |
中等 |
| Self Dividing Numbers |
简单 |
| Cracking the Safe |
困难 |
| Reach a Number |
中等 |
| Global and Local Inversions |
中等 |
| Reaching Points |
困难 |
| Transform to Chessboard |
困难 |
| Rabbits in Forest |
中等 |
| Escape The Ghosts |
中等 |
| Valid Tic-Tac-Toe State |
中等 |
| Chalkboard XOR Game |
困难 |
| Largest Triangle Area |
简单 |
| String to Integer (atoi) |
中等 |
| Consecutive Numbers Sum |
中等 |
| Fraction to Recurring Decimal |
中等 |
| Excel Sheet Column Title |
简单 |
| Excel Sheet Column Number |
简单 |
| Factorial Trailing Zeroes |
简单 |
| Count Primes |
简单 |
| Happy Number |
简单 |
| Rectangle Area |
中等 |
| Basic Calculator |
困难 |
| Number of Digit One |
困难 |
| Add Digits |
简单 |
| Ugly Number |
简单 |
| Ugly Number II |
中等 |
| Missing Number |
简单 |
| Perfect Squares |
中等 |
| Super Ugly Number |
中等 |
| Bulb Switcher |
中等 |
| Power of Three |
简单 |
| Mirror Reflection |
中等 |
| Prime Palindrome |
中等 |
| Add Two Numbers |
中等 |
| Stone Game |
中等 |
| Nth Magical Number |
困难 |
| Generate Random Point in a Circle |
中等 |
| Integer Break |
中等 |
| Projection Area of 3D Shapes |
简单 |
| Spiral Matrix III |
中等 |
| Super Egg Drop |
困难 |
| Surface Area of 3D Shapes |
简单 |
| Palindrome Number |
简单 |
| Water and Jug Problem |
中等 |
| Orderly Queue |
困难 |
| Numbers At Most N Given Digit Set |
困难 |
| Super Palindromes |
困难 |
| Valid Perfect Square |
简单 |
| Largest Divisible Subset |
中等 |
| X of a Kind in a Deck of Cards |
简单 |
| Sum of Subsequence Widths |
困难 |