Submission #306804

#	Time	Username	Problem	Language	Result	Execution time	Memory
306804		MrDomino	Furniture (JOI20_furniture)	C++14	0 / 100	18 ms	1408 KiB

furniture

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 2000 + 7;
int n;
int m;
int a[N][N];
bool down[N][N];
bool up[N][N];
bool on[N][N];
int cnt[2 * N];

void init()
{
    for (int i = 1; i <= n + m; i++)
    {
        cnt[i] = 0;
    }
    down[n + 1][m] = 1;
    up[1][0] = 1;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            if (a[i][j] == 0)
            {
                up[i][j] = up[i - 1][j] | up[i][j - 1];
            }
            else
            {
                up[i][j] = 0;
            }
        }
    }
    for (int i = n; i >= 1; i--)
    {
        for (int j = m; j >= 1; j--)
        {
            if (a[i][j] == 0)
            {
                down[i][j] = down[i + 1][j] | down[i][j + 1];
            }
            else
            {
                down[i][j] = 0;
            }
        }
    }
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            if (up[i][j] && down[i][j])
            {
                cnt[i + j]++;
                on[i][j] = 1;
            }
        }
    }
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    ///freopen ("input", "r", stdin);

    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            cin >> a[i][j];
        }
    }
    init();
    int q;
    cin >> q;
    while (q--)
    {
        int r, c;
        cin >> r >> c;
        if (on[r][c] == 0)
        {
            cout << "1\n";
            continue;
        }
        if (cnt[r + c] == 1)
        {
            cout << "0\n";
            continue;
        }
        cout << "1\n";
        a[r][c] = 1;
        init();
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95