ds lab 8 task 3

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m,a,i,sum,r,c=0;;
    cin>>m;
    if(m<=0||m>=100)
    {
        cout<<"Invalid input"<<endl;
        return 0;
    }
    unordered_map<int,int>mp;
    for(i=0; i<m; i++)
    {
        cin>>a;
        mp[a]++;
    }
    cin>>sum;
    for(auto j:mp)
    {
        if(j.second>0)
        {
            r=sum-j.first;
            if(mp.find(r)!=mp.end())
            {
                if(c==0)
                cout<<"Pairs with sum "<<sum<<" are:";
                cout<<" ("<<j.first<<","<<r<<") ";
                c=1;
                mp[r]=0;
                j.second=0;
            }
        }
    }
    if(c==0)
        cout<<"No pairs found"<<endl;

}