Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is intended for this problem to be spe…

题目: 字符串转换为数字. 解法: 这道题的意思是要考虑到,如果有前置的空字符,则跳过:如果超出数字范围,则返回最大/最小整数:如果碰到第一个不能转换的字符,则返回. 代码: class Solution { public: int atoi(const char *str) { , result = ; int len = strlen(str); ; for( ; i < len && str[i] == ' '; ++i) //跳过前置的空字符 ; if(str[i] == '…

Leetcode 8. String to Integer (atoi) atoi函数实现 (字符串) 题目描述 实现atoi函数,将一个字符串转化为数字 测试样例 Input: "42" Output: 42 Input: " -42" Output: -42 Input: "4193 with words" Output: 4193 Input: "words and 987" Output: 0 详细分析 这道题的cor…

前言   [LeetCode 题解]系列传送门:  http://www.cnblogs.com/double-win/category/573499.html   1.题目描述 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 2. 思路 找到规则即可 罗马数字的表示: I~1 V~5 X~10 L~50 C~100 D~500…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com'https://oj.leetcode.com/problems/string-to-integer-atoi/ Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please…

1.  String to Integer (atoi) Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is inte…

String to Integer (atoi) Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is intended f…

实现字符串转整形数字 遵循几个规则: 1. 函数首先丢弃尽可能多的空格字符,直到找到第一个非空格字符. 2. 此时取初始加号或减号. 3. 后面跟着尽可能多的数字,并将它们解释为一个数值. 4. 字符串可以在组成整数的字符之后包含其他字符,这些字符将被忽略,并且对该函数的行为没有影响. 5. 如果str中的第一个非空格字符序列不是有效的整数,则为0. Runtime: 16 ms, faster than 62.80% of C++ online submissions for String t…

8. String to Integer (atoi) Medium Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the first non-whitespace character is found. Then, starting from this character, tak…

一.题目链接:https://leetcode.com/problems/string-to-integer-atoi/ 二.题目大意: 实现一个和C语言里atoi具有相同功能的函数,即能够把字符串转换成整型.例如:输入字符串“-123”,返回值为一个整数-123. 三.题解: 这道题也属于字符串处理类的题目,只要看懂题目所给定的规则就好了,题目给的规则大致如下: 1.若一开始遇到连续的2空白字符,则忽略这些字符,直到遇到第一个非空白字符. 2.若遇到的第一个空白字符为'+'或者'-',则只有下…