map秒杀

#include<bits/stdc++.h>
using namespace std;
int main(){
map<int,int> a;
int n;
cin >> n;
for(int i = 0;i < n;i ++){
int x;
cin >> x;
a[x] ++;
}
for(auto it : a){
cout << it.first << " " << it.second << endl;
}
return 0;
}