set map ấy ạ, sửa dùm vs

#include <bits/stdc++.h>
#define N (int)1e5
#define ll long long
using namespace std;
map <string, string> s;
map <string, string > :: iterator it,ti;
int n,m=0;
string x,y;
int main()
{
      ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
 // freopen("citystate.INP","r",stdin);
 // freopen("citystate.OUT","w",stdout);
    cin>>n;
   for (int i=1;i<=n;i++)
  {
    cin>>x>>y;
    x=x.substr(0,2);
  s.insert({y,x});
  if(s[x]==y) m++;
  }

  cout<<m;
    return 0;
}

set map ấy ạ, sửa dùm vs #include &lt;bits/stdc++.h> #define N (int)1e5 #define ll long long using namespace std; map &lt;string, string> s; map &lt;string, st