frankming

摘要： 题目 An image is represented by an m x n integer grid image where image[i][j] represents the pixel value of the image. You are also given three integers 阅读全文

摘要： 题目 Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1's permuta 阅读全文