摘要： 题目如下： Given an array of integers arr, replace each element with its rank. The rank represents how large the element is. The rank has the following rul 阅读全文

摘要： 题目如下： Given a m * n matrix mat of integers, sort it diagonally in ascending order from the top-left to the bottom-right then return the sorted array. 阅读全文

摘要： 题目如下： Given a palindromic string palindrome, replace exactly one character by any lowercase English letter so that the string becomes the lexicographi 阅读全文