Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the inpu…

Write a function to find the longest common prefix string amongst an array of strings. 没啥难度，不多说了 pub…

Determine whether an integer is a palindrome. Do this without extra space. 这道题其实挺没意思的，不能用extra space…

Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the chara…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. Follow…

Given a string, determine if a permutation of the string could form a palindrome. For example, “code…