1. Code

#include <iostream>

using namespace std;

int main(void) {
    int nums[9];
    int max=0 ,idx=0;

    for (int i=0 ; i<9 ; i++) {
        cin >> nums[i];
    }
    for (int i=0 ; i<9 ; i++) {
        if (nums[i] > max) {
            max = nums[i];
            idx = i;
        } 
    }

    cout << max << "\n" << idx+1 << "\n";
    return 0;
}

2. Result

        Runtime : 0 ms, Memory usage : 2016 KB
        (Runtime can be different by a system even if it is a same code.)

Check out the my GitHub repo for more info on the code. If you have questions, you can leave a reply on this post.