题目

代码

#include <iostream>
using namespace std;

int main() {
    int n, num;
    const int M =1.5e9; 
    int nu[M] ;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> num;
        nu[num]++;
    }
    for (int i = 0; i < M; i++) {
        if (nu[i] > 0) {
            cout << i << " " << nu[i] << endl;
        }
    }
    return 0;
}

QWQ