为什么代码不起作用并给出错误的 output？

Question

we are given a string s and length n. We have to print the sum of (no. of every character - given i).

If we are given c no's of i.we have:

n c
s
i in next lines

input
10 2
    aabbaabbcc
    1
    3

output:

7 2

explain:

7 = 4a's - 1 + 4 b's - 1 + 2c's - 1

code:

#include <iostream>
#include <bits/stdc++.h> 
using namespace std;

int solve(string s,int n){
    unordered_map<char,int> m;
      int k;
      cin>>k;
      for(int i=0 ; i< n ;i++){
          m[s[i]]++;
      }

       unordered_map<char, int>:: iterator p; 
       int sum=0;
       for (p = m.begin(); p != m.end(); p++){
           p->second -= k ;
        if(p->second>0){
            sum++;
        }
} 
   return sum;
  }
int main() {
    // your code goes here

        int n , q;
        cin>>n>>q;

       string s;
      cin>>s;

     vector<int> r;
      for(int i = 1 ; i<=q;i++){

         int sb = solve(s,n);
         r.push_back(sb);
      }
      for(int i = 0 ; i<q;i++){

        cout<<r[i]<<endl;
      }


    return 0;
}

Answer 1

Simple mistake

    if (p->second>0){
        sum++;
    }

should be

    if (p->second > 0) {
        sum += p->second;
    }

You should learn to use a debugger. It would have shown you what the problem was very quickly.