387. First Unique Character in a String

trival

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