Problem p02670 (C++) — buggy submission, verdict: Runtime Error

#pragma GCC optimize("O3")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

unsigned char D[252004];
bool E[252004];
unsigned int Q[300000];
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N;
  cin >> N;
  int n = N + 2;
  rep1(i, N) {
    int ij = n * i + 1;
    unsigned char kari = min(i - 1, N - i) + 2;
    unsigned char kari2 = 2;
    rep1(j, N / 2) { D[ij++] = min(kari, kari2++); }
    if (N % 2 == 0)
      kari2--;
    for (int j = N / 2 + 1; j <= N; j++) {
      D[ij++] = min(kari, kari2--);
    }
  }

  int kotae = 0;
  rep(k, N * N) {
    int ij;
    cin >> ij;
    ij += (ij - 1) / N * 2 + N + 2;

    kotae += D[ij]--;
    E[ij] = 1;

    int p = 0, q = 0;
    Q[p++] = ij;

    while (p > q) {
      int ij = Q[q++];
      int d = D[ij] + 1;

      if (D[ij - n] > d - E[ij - n]) {
        D[ij - n] = d - E[ij - n];
        Q[p++] = ij - n;
      }
      if (D[ij + n] > d - E[ij + n]) {
        D[ij + n] = d - E[ij + n];
        Q[p++] = ij + n;
      }
      if (D[ij - 1] > d - E[ij - 1]) {
        D[ij - 1] = d - E[ij - 1];
        Q[p++] = ij - 1;
      }
      if (D[ij + 1] > d - E[ij + 1]) {
        D[ij + 1] = d - E[ij + 1];
        Q[p++] = ij + 1;
      }
    }
  }

  co(kotae - 2 * N * N);

  Would you please return 0;
}

Error: 0

Fixed submission:

#pragma GCC optimize("O3")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

unsigned char D[252004];
bool E[252004];
unsigned int Q[200000];
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N;
  cin >> N;
  int n = N + 2;
  rep1(i, N) {
    int ij = n * i + 1;
    unsigned char kari = min(i - 1, N - i) + 2;
    unsigned char kari2 = 2;
    rep1(j, N / 2) { D[ij++] = min(kari, kari2++); }
    if (N % 2 == 0)
      kari2--;
    for (int j = N / 2 + 1; j <= N; j++) {
      D[ij++] = min(kari, kari2--);
    }
  }

  int kotae = 0;
  rep(k, N * N) {
    int ij;
    cin >> ij;
    ij += (ij - 1) / N * 2 + N + 2;

    kotae += D[ij]--;
    E[ij] = 1;

    int p = 0, q = 0;
    Q[p++] = ij;

    while (p > q) {
      int ij = Q[q++];
      int d = D[ij] + 1;

      if (D[ij - n] > d - E[ij - n]) {
        D[ij - n] = d - E[ij - n];
        Q[p++] = ij - n;
      }
      if (D[ij + n] > d - E[ij + n]) {
        D[ij + n] = d - E[ij + n];
        Q[p++] = ij + n;
      }
      if (D[ij - 1] > d - E[ij - 1]) {
        D[ij - 1] = d - E[ij - 1];
        Q[p++] = ij - 1;
      }
      if (D[ij + 1] > d - E[ij + 1]) {
        D[ij + 1] = d - E[ij + 1];
        Q[p++] = ij + 1;
      }
    }
  }

  co(kotae - 2 * N * N);

  Would you please return 0;
}