Submission #362160

#	Time	Username	Problem	Language	Result	Execution time	Memory
362160		vishesh312	Rectangles (IOI19_rect)	C++17	37 / 100	2180 ms	1048580 KiB

rect

#include "bits/stdc++.h"
using namespace std;

using ll = long long;

ll count_rectangles(vector<vector<int>> a) {
    ll ans = 0, cnt = 0;
    int n = a.size();
    int m = a[0].size();
    if (n <= 2 or m <= 2) {
        return 0;
    }
    int mx[n][m][m], mx2[m][n][n];
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            mx[i][j][j] = a[i][j];
            for (int k = j+1; k < m; ++k) {
                mx[i][j][k] = max(mx[i][j][k-1], a[i][k]);
            }
        }
    }
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j) {
            mx2[i][j][j] = a[j][i];
            for (int k = j+1; k < n; ++k) {
                mx2[i][j][k] = max(mx2[i][j][k-1], a[k][i]);
            }
        }
    }
//  vector<array<int, 4>> vec;
    for (int i = 1; i < n-1; ++i) {
        for (int j = 1; j < m-1; ++j) {
            pair<int, int> top_right{i, j};
            for (int k = i; k < n-1; ++k) {
                for (int l = j; l < m-1; ++l) {
                    pair<int, int> bottom_left{k, l};
                    bool cont = false;
                    for (int row = top_right.first; row <= bottom_left.first; ++row) {
                        int maxi = mx[row][top_right.second][bottom_left.second];
                        if (maxi >= min(a[row][top_right.second-1], a[row][bottom_left.second+1])) {
                            cont = true;
                            break;
                        }
                    }
                    if (cont) continue;
                    cnt++;
                    for (int col = top_right.second; col <= bottom_left.second; ++col) {
                        int maxi = mx2[col][top_right.first][bottom_left.first];
/*                      if (i == 1 and j == 4 and k == 1 and l == 5) {
                            cout << "maxi : " << maxi << '\n';
                            cout << "upar : " << a[top_right.first-1][col] << '\n';
                            cout << "neeche : " << a[bottom_left.first+1][col] << '\n';
                        }
*/                      if (maxi >= min(a[top_right.first-1][col], a[bottom_left.first+1][col])) {
//                      if (i == 1 and j == 4 and k == 1 and l == 5) {cout << "cont hua\n";}
                            cont = true;
                            break;
                        }
                    }
                    if (cont) continue;
                    ans++;
//                  vec.push_back({i, j, k, l});
                }
            }
        }
    }
//  for (auto x : vec) {
//      for (auto y : x) cout << y << " " ;
//      cout << '\n';
//  }
//  cout << "cnt : " << cnt << '\n';
    return ans;
}
/*
int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> v(n, vector<int>(m));
    for (auto &x : v) for (auto &y : x) cin >> y;
    cout << count_rectangles(v);
}
*/

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