Submission #263431

#	Time	Username	Problem	Language	Result	Execution time	Memory
263431		Bruteforceman	Rectangles (IOI19_rect)	C++14	0 / 100	35 ms	896 KiB

rect

#include "bits/stdc++.h"
#include "rect.h"
using namespace std;
struct rect {
  int i, j;
  int l, r;
  rect (int i, int j, int l, int r) : i(i), j(j), l(l), r(r) {}
  rect () {}
};

vector <rect> getLines(vector<std::vector<int>> a) {
  int n = a.size();
  int m = a.front().size();
  vector <int> v[m];
  vector <rect> vert;
  for(int i = 0; i < n; i++) {
    vector <int> last (n, -1);
    for(int j = 0; j < m; j++) {
      vector <int> aux (n, -1);
      while(!v[j].empty() && a[v[j].back()][j] < a[i][j]) {
        aux[v[j].back()] = 1;
        v[j].pop_back();
      }
      if(not v[j].empty()) {
        aux[v[j].back()] = 1;
      }
      v[j].push_back(i);
      for(int k = 0; k < i; k++) {
        if(last[k] != -1) {
          if(aux[k] == -1) {
            if(k - 1 < i) vert.push_back(rect(k, i, last[k], j - 1));
            last[k] = -1;
          }
        } else if (aux[k] == 1) {
          last[k] = j;
        }
      }
    }
    for(int k = 0; k < i; k++) {
      if(last[k] != -1) {
        if(k < i - 1) vert.push_back(rect(k, i, last[k], m - 1));
      }
    }
  }
	return vert;
}
vector <vector <int>> rotate(vector <vector <int>> a) {
  int n = a.size();
  int m = a.front().size();
  vector <vector <int>> b (m, vector <int> (n, 0));
  for(int i = 0; i < m; i++) {
    for(int j = 0; j < n; j++) {
      b[i][j] = a[j][i];
    }
  }
  return b;
}
/*
0 2 1 2
2 4 0 1
1 4 4 4
*/
long long count_rectangles(vector <vector <int>> a) {
  auto h = getLines(a);
  auto v = getLines(rotate(a));
  for(auto &x : v) {
    x.l -= 1;
    x.r += 1;
  }
  for(auto &x : h) {
    x.l -= 1;
    x.r += 1;
  }
  long long ans = 0;
  for(auto x : v) {
    for(auto y : h) {
      if(x.l <= y.i && y.j <= x.r) {
        if(y.l <= x.i && x.j <= y.r) {
          ++ans;
        }
      }
    }
  }
  return ans;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 0 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28