Submission #561958

#	Time	Username	Problem	Language	Result	Execution time	Memory
561958		4fecta	Furniture (JOI20_furniture)	C++17	100 / 100	296 ms	27728 KiB

furniture

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define boost() cin.tie(0), cin.sync_with_stdio(0)

const int MN = 1005;

int n, m, q, r, c, a[MN][MN], reach[MN][MN], cnt[MN + MN];

void block(int i, int j) {
    reach[i][j] = 0;
    cnt[i + j]--;
    if (!reach[i + 1][j - 1] && reach[i + 1][j]) block(i + 1, j);
    if (!reach[i + 1][j - 1] && reach[i][j - 1]) block(i, j - 1);
    if (!reach[i - 1][j + 1] && reach[i - 1][j]) block(i - 1, j);
    if (!reach[i - 1][j + 1] && reach[i][j + 1]) block(i, j + 1);
}

int32_t main() {
    boost();

    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            reach[i][j] = 1;
            cnt[i + j]++;
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
            if (a[i][j] && reach[i][j]) block(i, j);
        }
    }
    cin >> q;
    while (q--) {
        cin >> r >> c;
        if (!reach[r][c]) printf("1\n");
        else if (cnt[r + c] == 1) printf("0\n");
        else printf("1\n"), block(r, c);
    }

    return 0;
}

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