题解

#include <bits/stdc++.h>
using namespace std;
map<int,int> mp;
int n,x;
int main(){
    cin>>n;
    while(n--){
        cin>>x;
        mp[x]++;
    }
    map<int,int>::iterator iter;
    for(iter=mp.begin();iter!=mp.end();iter++){
        cout<<iter->first<<" "<<iter->second<<"\n";
    }
    return 0;
}