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Given a positive integer, return its corresponding column title as appear in an Excel sheet. For exa…

Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, retur…

Given an array of strings, group anagrams together. For example, given: [“eat”, “tea”, “tan”, “ate”,…

Given a non-empty string check if it can be constructed by taking a substring of it and appending mu…

Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a v…

Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2…

Given a string, you need to reverse the order of characters in each word within a sentence while sti…

Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite…

LeetCode上的相关题目(easy) 9, 14, 20, 28, 58, 66, 73, 125, 168, 171, 186, 189, 205,242, 246, 266, 290, 293…

You are given a string representing an attendance record for a student. The record only contains the…

Given a string s and a non-empty string p, find all the start indices of p‘s anagrams in s. St…

Count the number of segments in a string, where a segment is defined to be a contiguous sequence of …

Write a program that outputs the string representation of numbers from 1 to n. But for multiples of …

Given a string which consists of lowercase or uppercase letters, find the length of the longest pali…

Given a non-empty string s and an abbreviation abbr, return whether the string matches with the give…