LeetCode: 387. First Unique Character in a String

051105

题目

Given a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1.

Examples:

s = "leetcode"
return 0.s = "loveleetcode",
return 2.

Note: You may assume the string contain only lowercase letters.

我的解题思路

这道题的解题思路跟LeetCode：383. Ransom Note类似，首先可以先建立一个map，遍历字符串，计算每个字符的出现的次数，之后返回第一个只出现一次的字符的位置即可。

class Solution {
public:int firstUniqChar(string s) {if(s.length()==0) return -1;unordered_map<char, int> map(26);for (int i = 0; i < s.length(); ++i)++map[s[i]];for (int i = 0; i < s.length(); ++i){if(map[s[i]]==1) return i;}return -1;}
};

围观了一波大佬的解法，发现能跟上了，加油！

LeetCode: 387. First Unique Character in a String相关推荐

[LeetCode]--387. First Unique Character in a String
Given a string, find the first non-repeating character in it and return it's index. If it doesn't ex ...
python leetcode 387. First Unique Character in a String
利用find函数能极大地减少运行时间 class Solution:def firstUniqChar(self, s):""":type s: str:rtype: i ...
387. 字符串中的第一个唯一字符(javascript)387. First Unique Character in a String
leetcode:https://leetcode-cn.com/problems/first-unique-character-in-a-string/ 387. 字符串中的第一个唯一字符给定一个 ...
387. First Unique Character in a String QuestionEditorial Solution
Given a string, find the first non-repeating character in it and return it's index. If it doesn't ex ...
LeetCode之First Unique Character in a String
1.题目 Given a string, find the first non-repeating character in it and return it's index. If it doesn ...
387. First Unique Character in a String
Given a string, find the first non-repeating character in it and return it's index. If it doesn't ex ...
leetcode 387. 字符串中的第一个唯一字符(First Unique Character in a String)
目录题目描述: 示例: 解法: 题目描述: 给定一个字符串,找到它的第一个不重复的字符,并返回它的索引.如果不存在,则返回 -1. 示例: s = "leetcode"返回 0. ...
C#LeetCode刷题之#387-字符串中的第一个唯一字符（First Unique Character in a String）
问题该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/3939 访问. 给定一个字符串,找到它的第一个不重复的字符,并返回 ...
First Unique Character in a String(leetcode387)
2019独角兽企业重金招聘Python工程师标准>>> Given a string, find the first non-repeating character in it an ...

LeetCode: 387. First Unique Character in a String

题目

我的解题思路

LeetCode: 387. First Unique Character in a String相关推荐

最新文章

热门文章