LeetCode 387. First Unique Character in a String
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解题思路:先用一个map存放string里面每个字符出现的次数,然后遍历string每个字符,如果字符出现的次数为1就返回index,否则就返回-1
class Solution {public: int firstUniqChar(string s) { map<char,int> s_m; for(int i = 0; i < s.length(); i++){ s_m[s[i]]++; } for(int i = 0; i < s.length(); i++) if (s_m.find(s[i])->second == 1) return i; return -1; }}; 0 0
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