perseverance_wang的博客

Leetcode-08-String to Integer (atoi)题目链接解题思路：atoi的实现，有很多细节需要注意。两个判断条件很关键。INT_MAX/10 >= sum和INT_MAX - digit >= sum这两个判断条件确保了不会溢出。class Solution: # @return an integer def atoi(self, str...

Leetcode练习01题目加粗样式来源于leetcode 01 -------> two-sum问题描述给定一个整数数组，和一个确定的数值target，返回数组中的两数之和等于target的下标例：Given nums = [2, 7, 11, 15], target = 9,Because nums[0] + nums[1] = 2 + 7 = 9,return [0,...

Leetcode-07 Reverse Integer题目：Given a 32-bit signed integer, reverse digits of an integer.Example 1:Input: 123Output: 321Example 2:Input: -123Output: -321Example 3:Input: 120Output: 21...