Submission #1295668

#	Time	Username	Problem	Language	Result	Execution time	Memory
1295668		baotoan655	Furniture (JOI20_furniture)	C++20	100 / 100	232 ms	6396 KiB

furniture

#include <bits/stdc++.h>
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
using namespace std;

const int N = 1005;
int n, m;
int f[N][N];
int cnt[N + N];

void dfs(int i, int j);
void go(int i, int j) {
    if(f[i][j] == 1) return;
    if(i == 1 && j == 1) return;
    if(i == n && j == m) return;
    if((f[i - 1][j] && f[i][j - 1]) || (f[i + 1][j] && f[i][j + 1])){
        dfs(i, j);
    }
}
void dfs(int i, int j) {
    if(f[i][j]) return;
    f[i][j] = 1;
    --cnt[i + j];
    go(i - 1, j);
    go(i, j - 1);
    go(i + 1, j);
    go(i, j + 1);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    file("A") else file("task");
    cin >> n >> m;
    for(int i = 0; i <= n + 1; ++i) f[i][0] = f[i][m + 1] = 1;
    for(int j = 0; j <= m + 1; ++j) f[0][j] = f[n + 1][j] = 1;
    for(int i= 1; i <= n; ++i) for(int j = 1; j <= m; ++j) ++cnt[i + j];
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= m; ++j) {
            int x;
            cin >> x;
            if(x) dfs(i, j);
        }
    }
    int q;
    cin >> q;
    while(q--) {
        int x, y;
        cin >> x >> y;
        if(f[x][y]) cout << 1 << '\n';
        else if(cnt[x + y] == 1) cout << 0 << '\n';
        else {
            dfs(x, y);
            cout << 1 << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:33:5: note: in expansion of macro 'file'
   33 |     file("A") else file("task");
      |     ^~~~
furniture.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:33:5: note: in expansion of macro 'file'
   33 |     file("A") else file("task");
      |     ^~~~
furniture.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:33:20: note: in expansion of macro 'file'
   33 |     file("A") else file("task");
      |                    ^~~~
furniture.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:33:20: note: in expansion of macro 'file'
   33 |     file("A") else file("task");
      |                    ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95