Letter Combinations of a Phone NumberGiven a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons)
3Sum ClosestGiven an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would
Integer to RomanGiven an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 提示 解題應用 Math 規律觀查 String 規律觀查 Default:123func intToRoman(num in
Container With Most WaterGiven n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, a
Repeated Substring PatternGiven a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You may assume the given string
Longest Palindromic SubstringGiven a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1:12345Input: "babad"Output: "b
Longest Substring Without Repeating CharactersGiven a string, find the length of the longest substring without repeating characters. For Examples:12345Given "abcabcbb", the answer is "