387. First Unique Character in a String.cpp

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