| Valid Palindrome |
Solution |
Easy |
| Two Sum |
Solution |
Easy |
| Palindrome Number |
Solution |
Easy |
| Remove Duplicates from Sorted Array |
Solution |
Easy |
| Find the Index of the First Occurrence in a String |
Solution |
Easy |
| Search Insert Position |
Solution |
Easy |
| Length of Last Word |
Solution |
Easy |
| Plus One |
Solution |
Easy |
| Sqrt(x) |
Solution |
Easy |
| Climbing Stairs |
Solution |
Easy |
| Merge Sorted Array |
Solution |
Easy |
| Single Number |
Solution |
Easy |
| Summary Ranges |
Solution |
Easy |
| Ugly Number |
Solution |
Easy |
| Majority Element |
Solution |
Easy |
| Happy Number |
Solution |
Easy |
| Add Digits |
Solution |
Easy |
| Valid Anagram |
Solution |
Easy |
| Missing Number |
Solution |
Easy |
| Move Zeroes |
Solution |
Easy |
| Word Pattern |
Solution |
Easy |
| Nim Game |
Solution |
Easy |
| Reverse String |
Solution |
Easy |
| Reverse Vowels of a String |
Solution |
Easy |
| Counting Bits |
Solution |
Easy |
| Intersection of Two Arrays |
Solution |
Easy |
| First Unique Character in a String |
Solution |
Easy |
| Find the Difference |
Solution |
Easy |
| Ransom Note |
Solution |
Easy |
| Is Subsequence |
Solution |
Easy |
| Longest Palindrome |
Solution |
Easy |
| Fizz Buzz |
Solution |
Easy |
| Third Maximum Number |
Solution |
Easy |
| Number of Segments in a String |
Solution |
Easy |
| Arranging Coins |
Solution |
Easy |
| Find All Numbers Disappeared in an Array |
Solution |
Easy |
| Assign Cookies |
Solution |
Easy |
| Repeated Substring Pattern |
Solution |
Easy |
| Hamming Distance |
Solution |
Easy |
| Number Complement |
Solution |
Easy |
| License Key Formatting |
Solution |
Easy |
| Max Consecutive Ones |
Solution |
Easy |
| Next Greater Element I |
Solution |
Easy |
| Keyboard Row |
Solution |
Easy |
| Base 7 |
Solution |
Easy |
| Relative Ranks |
Solution |
Easy |
| Longest Uncommon Subsequence I |
Solution |
Easy |
| Detect Capital |
Solution |
Easy |
| Reverse String II |
Solution |
Easy |
| Reverse Words in a String III |
Solution |
Easy |
| Array Partition |
Solution |
Easy |
| Distribute Candies |
Solution |
Easy |
| Longest Harmonious Subsequence |
Solution |
Easy |
| Can Place Flowers |
Solution |
Easy |
| Minimum Index Sum of Two Lists |
Solution |
Easy |
| Set Mismatch |
Solution |
Easy |
| Maximum Average Subarray I |
Solution |
Easy |
| Robot Return to Origin |
Solution |
Easy |
| Baseball Game |
Solution |
Easy |
| Binary Number with Alternating Bits |
Solution |
Easy |
| Count Binary Substrings |
Solution |
Easy |
| To Lower Case |
Solution |
Easy |
| Self Dividing Numbers |
Solution |
Easy |
| Largest Number At Least Twice of Others |
Solution |
Easy |
| Shortest Completing Word |
Solution |
Easy |
| Longest Continuous Increasing Subsequence |
Solution |
Easy |
| Prime Number of Set Bits in Binary Representation |
Solution |
Easy |
| Jewels and Stones |
Solution |
Easy |
| Rotate String |
Solution |
Easy |
| Unique Morse Code Words |
Solution |
Easy |
| Number of Lines to Write String |
Solution |
Easy |
| Most Common Word |
Solution |
Easy |
| Shortest Distance to a Character |
Solution |
Easy |
| Goat Latin |
Solution |
Easy |
| Positions of Large Groups |
Solution |
Easy |
| Flipping an Image |
Solution |
Easy |
| Backspace String Compare |
Solution |
Easy |
| Buddy Strings |
Solution |
Easy |
| Lemonade Change |
Solution |
Easy |
| Transpose Matrix |
Solution |
Easy |
| Binary Gap |
Solution |
Easy |
| Uncommon Words from Two Sentences |
Solution |
Easy |
| Optimal Partition of String |
Solution |
Easy |
| The K-th Factor of N |
Solution |
Easy |
| Monotonic Array |
Solution |
Easy |
| Reverse Only Letters |
Solution |
Easy |
| Sort Array by Parity II |
Solution |
Easy |
| Unique Email Addresses |
Solution |
Easy |
| Long Pressed Name |
Solution |
Easy |
| Number of Recent Calls |
Solution |
Easy |
| Valid Mountain Array |
Solution |
Easy |
| DI String Match |
Solution |
Easy |
| Delete Columns to Make Sorted |
Solution |
Easy |
| N-Repeated Element in Size 2N Array |
Solution |
Easy |
| Squares of a Sorted Array |
Solution |
Easy |
| Find the Town Judge |
Solution |
Easy |
| Find Common Characters |
Solution |
Easy |
| Maximize Sum of Array After K Negations |
Solution |
Easy |
| Complement of Base 10 Integer |
Solution |
Easy |
| Divisor Game |
Solution |
Easy |
| Binary Prefix Divisible by 5 |
Solution |
Easy |
| Remove Outermost Parentheses |
Solution |
Easy |
| Partition Array Into Three Parts With Equal Sum |
Solution |
Easy |
| Remove All Adjacent Duplicates In String |
Solution |
Easy |
| Maximum Number of Balloons |
Solution |
Easy |
| Relative Sort Array |
Solution |
Easy |
| Height Checker |
Solution |
Easy |
| Occurrences After Bigram |
Solution |
Easy |
| Duplicate Zeros |
Solution |
Easy |
| Distribute Candies to People |
Solution |
Easy |
| Defanging an IP Address |
Solution |
Easy |
| Number of Equivalent Domino Pairs |
Solution |
Easy |
| Minimum Absolute Difference |
Solution |
Easy |
| N-th Tribonacci Number |
Solution |
Easy |
| Day of the Year |
Solution |
Easy |
| Find Words That Can Be Formed by Characters |
Solution |
Easy |
| Unique Number of Occurrences |
Solution |
Easy |
| Split a String in Balanced Strings |
Solution |
Easy |
| Find Numbers with Even Number of Digits |
Solution |
Easy |
| Replace Elements with Greatest Element on Right Side |
Solution |
Easy |
| Find N Unique Integers Sum up to Zero |
Solution |
Easy |
| Find Lucky Integer in an Array |
Solution |
Easy |
| Decrypt String from Alphabet to Integer Mapping |
Solution |
Easy |
| Decompress Run-Length Encoded List |
Solution |
Easy |
| Convert Integer to the Sum of Two No-Zero Integers |
Solution |
Easy |
| Maximum 69 Number |
Solution |
Easy |
| Rank Transform of an Array |
Solution |
Easy |
| The K Weakest Rows in a Matrix |
Solution |
Easy |
| Number of Steps to Reduce a Number to Zero |
Solution |
Easy |
| Check If N and Its Double Exist |
Solution |
Easy |
| Count Negative Numbers in a Sorted Matrix |
Solution |
Easy |
| Sort Integers by The Number of 1 Bits |
Solution |
Easy |
| How Many Numbers Are Smaller than the Current Number |
Solution |
Easy |
| Increasing Decreasing String |
Solution |
Easy |
| Generate a String With Characters That Have Odd Counts |
Solution |
Easy |
| Lucky Numbers in a Matrix |
Solution |
Easy |
| Number of 1 Bits |
Solution |
Easy |
| Linked List Cycle |
Solution |
Easy |
| Remove Linked List Elements |
Solution |
Easy |
| Middle of the Linked List |
Solution |
Easy |
| Remove Duplicates from Sorted List |
Solution |
Easy |
| Power of Three |
Solution |
Easy |
| Reverse Linked List |
Solution |
Easy |
| Fibonacci Number |
Solution |
Easy |
| Maximum Score After Splitting a String |
Solution |
Easy |
| String Matching in an Array |
Solution |
Easy |
| Contains Duplicate II |
Solution |
Easy |
| Find the K-Beauty of a Number |
Solution |
Easy |
| Minimum Recolors to Get K Consecutive Black Blocks |
Solution |
Easy |
| Defuse the Bomb |
Solution |
Easy |
| Check If Two Chessboard Squares Have the Same Color |
Solution |
Easy |
| Kids With the Greatest Number of Candies |
Solution |
Easy |
| Check if All 1's Are at Least Length K Places Away |
Solution |
Easy |
| Consecutive Characters |
Solution |
Easy |
| Check If a Word Occurs as a Prefix of Any Word in a Sentence |
Solution |
Easy |
| Make Two Arrays Equal by Reversing Subarrays |
Solution |
Easy |
| Maximum Product of Two Elements in an Array |
Solution |
Easy |
| Shuffle the Array |
Solution |
Easy |
| XOR Operation in an Array |
Solution |
Easy |
| Sort Array by Parity |
Solution |
Easy |
| Create Target Array in the Given Order |
Solution |
Easy |
| Minimum Subsequence in Non-Increasing Order |
Solution |
Easy |
| Intersection of Two Linked Lists |
Solution |
Easy |
| Minimum Bit Flips to Convert Number |
Solution |
Easy |
| Count the Number of Consistent Strings |
Solution |
Easy |
| Reformat Date |
Solution |
Easy |
| Kth Largest Element in a Stream |
Solution |
Easy |
| Binary Tree Inorder Traversal |
Solution |
Easy |
| Path Sum |
Solution |
Easy |
| Binary Tree Preorder Traversal |
Solution |
Easy |
| Binary Tree Postorder Traversal |
Solution |
Easy |
| Count Complete Tree Nodes |
Solution |
Easy |
| Same Tree |
Solution |
Easy |
| Rank Transform of an Array |
Solution |
Easy |