Finding the frequency of each characters

#Finding frequency of each character in an string without using the hash-map…

// printing the frequency of each character..without using hashmap..
#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    getline(cin,s);
    vector<int> v(26,0);//frequency array..special array..
    for(int i=0;i<s.length();i++){
        char ch = s[i];
        int x = (int)ch;
        int idx = x-97;
        v[idx]+=1;
    }
    for(int i=0;i<v.size();i++){
        if(v[i]!=0){
            int ascii = 97+i;
            cout<<(char)ascii<<" "<<v[i]<<endl;
        }
    }
    return 0;
}

You can also do it easily using a char and integer map .. bye bye ..