C++ :

#include <cstdio>
int main(){
    int n;
    if(scanf("%d", &n) != 1) return 0;
    int best = -1, pos = 0;
    for(int i = 1; i <= n; i++){
        int x; scanf("%d", &x);
        if(x > best){ best = x; pos = i; }
    }
    printf("%d\n", pos);
    return 0;
}