leetcode_387 First Unique Character in a String
2016-08-29 22:44
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题目分析
给定一个字符串,找出该字符串中第一个不重复的字符,并返回其对应的下标。如果不存在,则返回-1。
解题思路
首先遍历字符串,统计每个字符出现的次数,然后在遍历字符串,找出第一个只出现一次的字符即可。
实现程序
给定一个字符串,找出该字符串中第一个不重复的字符,并返回其对应的下标。如果不存在,则返回-1。
解题思路
首先遍历字符串,统计每个字符出现的次数,然后在遍历字符串,找出第一个只出现一次的字符即可。
实现程序
int firstUniqChar(string s) { if (s.length() <= 0) return -1; vector<int> temp(256, 0); // 统计每个字符出现次数 for (int i = 0; i < s.length(); i++) { temp[s[i] - '0']++; } // 找到第一个只出现一次的字符对应的下标 for (int i = 0; i < s.length(); i++) { if (temp[s[i] - '0'] == 1) return i; } return -1; }
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