oj.uz

Submission #680081

# Submission time Handle Problem Language Result Execution time Memory
680081 2023-01-09T21:30:36 Z stevancv Furniture (JOI20_furniture) C++14
100 / 100
 725 ms 64032 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
#define sadd(a, b) a = Add(a, b)
#define smul(a, b) a = Mul(a, b)
using namespace std;
const int N = 1e3 + 2;
const int mod = 1e9 + 7;
int n, m;
bool a[N][N], uni[N][N], x[N][N], y[N][N], z[N][N];
set<pair<int, int>> pos[2 * N];
bool Can(int i, int j) {
    if (i == 1 && j == 1) return 1;
    if (i == n && j == m) return 1;
    if (z[i][j] == 0) return 1;
    return (z[i - 1][j] | z[i][j - 1]) & (z[i + 1][j] | z[i][j + 1]);
}
void Dfs(int i, int j) {
    if (i <= 0 || i > n) return;
    if (j <= 0 || j > m) return;
    z[i][j] = 0;
    pos[i + j].erase({i, j});
    if (pos[i + j].size() == 1) {
        int ii = pos[i + j].begin()->first;
        int jj = pos[i + j].begin()->second;
        uni[ii][jj] = 1;
    }
    if (!Can(i - 1, j)) Dfs(i - 1, j);
    if (!Can(i, j - 1)) Dfs(i, j - 1);
    if (!Can(i + 1, j)) Dfs(i + 1, j);
    if (!Can(i, j + 1)) Dfs(i, j + 1);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
            pos[i + j].insert({i, j});
        }
    }
    for (int l = 2; l <= n + m; l++) {
        if (pos[l].size() == 1) {
            int ii = pos[l].begin()->first;
            int jj = pos[l].begin()->second;
            uni[ii][jj] = 1;
        }
    }
    x[1][1] = 1;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            x[i][j] |= x[i - 1][j] | x[i][j - 1];
        }
    }
    y[n][m] = 1;
    for (int i = n; i >= 1; i--) {
        for (int j = m; j >= 1; j--) {
            y[i][j] |= y[i + 1][j] | y[i][j + 1];
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            z[i][j] = x[i][j] & y[i][j];
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] == 1) Dfs(i, j);
        }
    }
    int q; cin >> q;
    while (q--) {
        int i, j;
        cin >> i >> j;
        if (uni[i][j] == 1) {
            cout << 0 << en;
        }
        else {
            cout << 1 << en;
            Dfs(i, j);
        }
    }
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 980 KB Output is correct
2 Correct 3 ms 1108 KB Output is correct
3 Correct 5 ms 1364 KB Output is correct
4 Correct 4 ms 1360 KB Output is correct
5 Correct 5 ms 1288 KB Output is correct
6 Correct 5 ms 1352 KB Output is correct
7 Correct 5 ms 1364 KB Output is correct
8 Correct 5 ms 1364 KB Output is correct
9 Correct 5 ms 1408 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 980 KB Output is correct
2 Correct 3 ms 1108 KB Output is correct
3 Correct 5 ms 1364 KB Output is correct
4 Correct 4 ms 1360 KB Output is correct
5 Correct 5 ms 1288 KB Output is correct
6 Correct 5 ms 1352 KB Output is correct
7 Correct 5 ms 1364 KB Output is correct
8 Correct 5 ms 1364 KB Output is correct
9 Correct 5 ms 1408 KB Output is correct
10 Correct 18 ms 3412 KB Output is correct
11 Correct 4 ms 1108 KB Output is correct
12 Correct 593 ms 50124 KB Output is correct
13 Correct 342 ms 45268 KB Output is correct
14 Correct 671 ms 51032 KB Output is correct
15 Correct 725 ms 54512 KB Output is correct
16 Correct 554 ms 58848 KB Output is correct
17 Correct 608 ms 62052 KB Output is correct
18 Correct 699 ms 60484 KB Output is correct
19 Correct 560 ms 63880 KB Output is correct
20 Correct 591 ms 64032 KB Output is correct
21 Correct 632 ms 63876 KB Output is correct