摘要：
Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element. We define an array is non-decr 阅读全文
摘要：
Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note:You may assume that nums1 has enough space (size tha 阅读全文
摘要：
Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library functio 阅读全文
摘要：
Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any leadin 阅读全文