AC题解

直接用函数也可以

#include <cmath>
#include <iostream>
using namespace std;

int main()
{
    long long n, a[105] = {};
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    for (int i = 1; i <= n; i++)
    {
        double d = a[i] / 10.0;
        long long cnt = round(d);
        long long l = cnt * 10;
        cout << l << endl;
    }
    return 0;
}