ABC113B - Palace

問題：B - Palace

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

#define REP(i, n) for (int i = 0; i < (n); ++i)

int main(void) {
    const int INF = 1 << 30;
    int n, t, a, h, min_a = INF, min_pos = 0;

    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    cin >> t >> a;
    REP(i, n) {
        cin >> h;
        if (min_a > abs(t * 1000 - h * 6 - a * 1000)) {
            min_pos = i + 1;
            min_a = abs(t * 1000 - h * 6 - a * 1000);
        }
    }

    cout << min_pos << "\n";
    return 0;
}

絶対値の取り方を間違えて1WA。。