oj.uz

Submission #553203

# Submission time Handle Problem Language Result Execution time Memory
553203 2022-04-25T04:37:14 Z tht2005 Furniture (JOI20_furniture) C++17
100 / 100
 336 ms 18784 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1003;

int dx[4] = { 0, 1, 0, -1 };
int dy[4] = { 1, 0, -1, 0 };
int n, m, cnt[N << 1], c[N][N];
bool f[N][N], g[N][N], r[N][N];

int main() {
    scanf("%d %d", &n, &m);
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= m; ++j) {
            scanf("%d", &c[i][j]);
        }
    }
    f[1][1] = 1;
    for(int i = 1; i <= n; ++i) {
        for(int j = 1 + (i == 1); j <= m; ++j) {
            if(c[i][j]) continue;
            f[i][j] = f[i - 1][j] || f[i][j - 1];
        }
    }
    g[n][m] = 1;
    for(int i = n; i > 0; --i) {
        for(int j = m - (i == n); j > 0; --j) {
            if(c[i][j]) continue;
            g[i][j] = g[i + 1][j] || g[i][j + 1];
        }
    }
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= m; ++j) {
            r[i][j] = f[i][j] && g[i][j];
            if(r[i][j]) {
                ++cnt[i + j];
            }
        }
    }
    r[0][1] = r[n + 1][m] = 1;
    int _;
    scanf("%d", &_);
    while(_--) {
        int x, y;
        scanf("%d %d", &x, &y);
        if(r[x][y]) {
            if(cnt[x + y] > 1) {
                queue<pair<int, int>> q;
                r[x][y] = 0;
                --cnt[x + y];
                q.emplace(x, y);
                while(!q.empty()) {
                    auto [u, v] = q.front();
                    q.pop();
                    for(int e = 0; e < 4; ++e) {
                        int a = u + dx[e], b = v + dy[e];
                        if(a < 1 || a > n || b < 1 || b > m || !r[a][b]) continue;
                        if((!r[a - 1][b] && !r[a][b - 1]) || (!r[a + 1][b] && !r[a][b + 1])) {
                            r[a][b] = 0;
                            --cnt[a + b];
                            q.emplace(a, b);
                        }
                    }
                }
                putchar('1');
            }
            else {
                putchar('0');
            }
        }
        else {
            putchar('1');
        }
        putchar('\n');
    }
    return 0;
}

Compilation message

furniture.cpp: In function 'int main()':
furniture.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
furniture.cpp:16:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |             scanf("%d", &c[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~
furniture.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%d", &_);
      |     ~~~~~^~~~~~~~~~
furniture.cpp:46:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 724 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 2 ms 872 KB Output is correct
4 Correct 3 ms 1000 KB Output is correct
5 Correct 4 ms 1088 KB Output is correct
6 Correct 4 ms 1108 KB Output is correct
7 Correct 3 ms 1088 KB Output is correct
8 Correct 3 ms 1108 KB Output is correct
9 Correct 4 ms 1108 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 724 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 2 ms 872 KB Output is correct
4 Correct 3 ms 1000 KB Output is correct
5 Correct 4 ms 1088 KB Output is correct
6 Correct 4 ms 1108 KB Output is correct
7 Correct 3 ms 1088 KB Output is correct
8 Correct 3 ms 1108 KB Output is correct
9 Correct 4 ms 1108 KB Output is correct
10 Correct 9 ms 956 KB Output is correct
11 Correct 3 ms 608 KB Output is correct
12 Correct 162 ms 11656 KB Output is correct
13 Correct 98 ms 8664 KB Output is correct
14 Correct 248 ms 16152 KB Output is correct
15 Correct 267 ms 16456 KB Output is correct
16 Correct 242 ms 17444 KB Output is correct
17 Correct 336 ms 18348 KB Output is correct
18 Correct 271 ms 17728 KB Output is correct
19 Correct 288 ms 18648 KB Output is correct
20 Correct 279 ms 18784 KB Output is correct
21 Correct 264 ms 18624 KB Output is correct