oj.uz

Submission #1055212

# Submission time Handle Problem Language Result Execution time Memory
1055212 2024-08-12T15:28:01 Z RecursiveCo Rectangles (IOI19_rect) C++17
13 / 100
 170 ms 135292 KB 
#include <bits/stdc++.h>

using namespace std;

vector<vector<int>> pref;

int query(int r1, int c1, int r2, int c2) {
    int val = pref[r2][c2];
    val -= (c1? pref[r2][c1 - 1]: 0);
    val -= (r1? pref[r1 - 1][c2]: 0);
    val += (c1 && r1? pref[r1 - 1][c1 - 1]: 0);
    return val;
}

long long count_rectangles(vector<vector<int>> grid) {
    int n = grid.size();
    int m = grid[0].size();
    int maxi = -1;
    for (int i = 0; i < n; i++) maxi = max(maxi, *max_element(grid[i].begin(), grid[i].end()));
    if (maxi <= 1) {
        // Subtask 6
        pref.resize(n, vector<int>(m, 0));
        for (int i = 0; i < n; i++) {
            int prefhere = 0;
            for (int j = 0; j < m; j++) {
                prefhere += grid[i][j];
                pref[i][j] = (i? pref[i - 1][j]: 0) + prefhere;
            }
        }
        vector<vector<int>> left(n, vector<int>(m, -1));
        vector<vector<int>> above(n, vector<int>(m, -1));
        for (int i = 0; i < n; i++) {
            int here = -1;
            for (int j = 0; j < m; j++) {
                if (grid[i][j]) here = j;
                left[i][j] = here;
            }
        }
        for (int j = 0; j < m; j++) {
            int here = -1;
            for (int i = 0; i < n; i++) {
                if (grid[i][j]) here = i;
                above[i][j] = here;
            }
        }
        long long ans = 0;
        for (int i = 1; i < n - 1; i++) {
            for (int j = 1; j < m - 1; j++) {
                if (!grid[i][j] && grid[i + 1][j] && grid[i][j + 1] && left[i][j] != -1 && above[i][j] != -1) {
                    int l = left[i][j];
                    int t = above[i][j];
                    int bottom = query(i + 1, l + 1, i + 1, j);
                    int top = query(t, l + 1, t, j);
                    int leftside = query(t + 1, l, i, l);
                    int rightside = query(t + 1, j + 1, i, j + 1);
                    int inside = query(t + 1, l + 1, i, j);
                    if (bottom == j - l && top == j - l && leftside == i - t && rightside == i - t && !inside) ans++;
                }
            }
        }
        return ans;
    }
    return 0; // for subtasks I'm not solving.
}

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 95 ms 62204 KB Output is correct
3 Correct 169 ms 134536 KB Output is correct
4 Correct 170 ms 135252 KB Output is correct
5 Correct 168 ms 135252 KB Output is correct
6 Correct 62 ms 66896 KB Output is correct
7 Correct 126 ms 126868 KB Output is correct
8 Correct 129 ms 135292 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 436 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct

Subtask #7
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -