Submission #668062

#	Time	Username	Problem	Language	Result	Execution time	Memory
668062		600Mihnea	Adriatic (CEOI13_adriatic)	C++17	100 / 100	211 ms	131616 KiB

adriatic

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int N = 250000 + 7;
const int A = 2500 + 7;
const int INF = (int) 1e9 + 7;
int n;
int posr[N];
int posc[N];
int s[A][A];
int rmin[N];
int cmax[N];
int rmax[N];
int cmin[N];
ll s1[A][A];
ll s2[A][A];

int getsum(int r1, int c1, int r2, int c2)
{
  return s[r2][c2] - s[r1 - 1][c2] - s[r2][c1 - 1] + s[r1 - 1][c1 - 1];
}

pair<int, int> next1(pair<int, int> current)
{
  int r = current.first, c = current.second;
  return {min(r, rmin[c - 1]), max(c, cmax[r + 1])};
}

pair<int, int> next2(pair<int, int> current)
{
  int r = current.first, c = current.second;
  return {max(r, rmax[c + 1]), min(c, cmin[r - 1])};
}

int main()
{
#ifdef ONPC
  freopen ("input.txt", "r", stdin);
#endif // ONPC

#ifndef ONPC
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif // ONPC

  for (int i = 0; i < N; i++)
  {
    rmin[i] = INF;
    cmin[i] = INF;
  }

  cin >> n;
  for (int i = 1; i <= n; i++)
  {
    cin >> posr[i] >> posc[i];
    s[posr[i]][posc[i]]++;
    rmin[posc[i]] = min(rmin[posc[i]], posr[i]);
    cmax[posr[i]] = max(cmax[posr[i]], posc[i]);

    rmax[posc[i]] = max(rmax[posc[i]], posr[i]);
    cmin[posr[i]] = min(cmin[posr[i]], posc[i]);
  }
  for (int i = 1; i < A; i++)
  {
    rmin[i] = min(rmin[i - 1], rmin[i]);
    cmin[i] = min(cmin[i - 1], cmin[i]);
  }
  for (int i = A - 2; i >= 0; i--)
  {
    cmax[i] = max(cmax[i + 1], cmax[i]);
    rmax[i] = max(rmax[i + 1], rmax[i]);
  }
  for (int i = 1; i < A; i++)
  {
    int c = 0;
    for (int j = 1; j < A; j++)
    {
      c += s[i][j];
      s[i][j] = c + s[i - 1][j];
    }
  }
  for (int r = 0; r < A; r++)
  {
    for (int c = A - 1; c >= 0; c--)
    {
      pair<int, int> it = next1({r, c});
      s1[r][c] = getsum(1, c, r, A - 1) + s1[it.first][it.second];
    }
  }
  for (int r = A - 1; r >= 0; r--)
  {
    for (int c = 0; c < A; c++)
    {
      pair<int, int> it = next2({r, c});
      s2[r][c] = getsum(r, 1, A - 1, c) + s2[it.first][it.second];
    }
  }
  for (int init = 1; init <= n; init++)
  {
    cout << n - 3 + s1[posr[init]][posc[init]] + s2[posr[init]][posc[init]] << "\n";
  }

  return 0;
}
/**
**/

Compilation message (stderr)

adriatic.cpp: In function 'int main()':
adriatic.cpp:22:50: warning: iteration 2506 invokes undefined behavior [-Waggressive-loop-optimizations]
   22 |   return s[r2][c2] - s[r1 - 1][c2] - s[r2][c1 - 1] + s[r1 - 1][c1 - 1];
      |                                      ~~~~~~~~~~~~^
adriatic.cpp:85:27: note: within this loop
   85 |     for (int c = A - 1; c >= 0; c--)
      |                         ~~^~~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20