Spiraali

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll N;
ll T;
ll y_, x_;

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);

  cin >> N >> T;
  while (T--) {
    cin >> y_ >> x_;
    --y_, --x_;

    ll a = std::min({x_, y_, N - 1 - x_, N - 1 - y_});
    ll s = (N - (a * 2) - 1);
    ll res = (4 * (N - a) * a + 1);

    if ((y_ - a) < s && (x_ - a) == 0)
      res += (y_ - a);
    else if ((y_ - a) != 0 && (x_ - a) == s)
      res += (s * 2) + (s - (y_ - a));
    else if ((y_ - a) == s && (x_ - a) < s)
      res += s + (x_ - a);
    else
      res += (s * 3) + (s - (x_ - a));

    printf("%lld\n", res);
  }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED