代码交测试点1 - 4WA,5-10MLE,求改

#include<iostream>
using namespace std;
const int N = 1.5e9 + 5;
int a[N];
int main(){
    int n;
    cin >> n;
    for(int i = 1;i <= n;++i){
        int num;
        cin >> num;
        a[num]++;
    }
    for(int i = 1;i <= 200010;++i){
        if(a[i])cout  << i << " " << a[i] << endl;
    }
    return 0;
}