map直接秒

#include<bits/stdc++.h>
using namespace std;
int main(){
    map<long long,int> mp;
    int n; cin >> n;
    for(int i = 1;i <= n;i++){
        int t; cin >> t;
        mp[t]++;
    }
    for(auto i : mp) cout << i.first << " " << i.second << endl;
    return 0;
}