Young Physicist CodeForces 69A

I was doing the problem Young Physicist here and I got this compilation error when I did:
Can’t compile file:
program.c:1:20: fatal error: iostream: No such file or directory
compilation terminated.
This is the code I used when submitting and it works locally on my computer with the test cases so I’m not sure what’s wrong. Could someone please explain my mistake here? Thanks!

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

int main(){
    int n;
    cin >> n;
    int x, y, z;
    vector <int> a(n), b(n), c(n);
    for (int i = 0; i <n; i++){
        cin >> x;
        a[i] = x;
        cin >> y;
        b[i] = y;
        cin >> z;
        c[i] = z;
    }
    int sum1 = 0;
    for (int i = 0; i < n;i++){
        sum1 += a[i];
    }
    int sum2 = 0;
    for (int i = 0; i < n;i++){
        sum2 += b[i];
    }
    int sum3 = 0;
    for (int i = 0; i < n;i++){
        sum3 += c[i];
    }
    if (sum1 == 0 && sum2 == 0 && sum3 == 0) cout << "YES" << endl;
    else cout << "NO" << endl;
}

Are you sure you’re submitting with C++? It seems you’re submitting with C instead.