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  • 39. Combination Sum

    Given a set of candidate numbers (candidates) (without duplicates) and a...

  • 13. Roman to Integer

    Roman numerals are represented by seven different symbols: I, V, X, L, C...

  • 12. Integer to Roman

    Roman numerals are represented by seven different symbols: I, V, X, L, C...

  • 28. Implement strStr()

    Implement strStr(). Return the index of the first occurrence of needle i...

  • 3. Longest Substring Without Repeating Characters

    Given a string, find the length of the longest substring without repeati...

  • 5. Longest Palindromic Substring

    Given a string s, find the longest palindromic substring in s. You may a...

  • 6. ZigZag Conversion

    The string "PAYPALISHIRING" is written in a zigzag pattern on a given nu...

  • 9. Palindrome Number(C++)

    Determine whether an integer is a palindrome. An integer is a palindrome...

  • leetcode 7. Reverse Integer(C++)

    Given a 32-bit signed integer, reverse digits of an integer. Example 1: ...