first_unique_character_string.cpp

//Probelm link: https://leetcode.com/problems/first-unique-character-in-a-string/

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