Submission #1360187

#TimeUsernameProblemLanguageResultExecution timeMemory
1360187iamhereforfunFurniture (JOI20_furniture)C++20
5 / 100
5094 ms19976 KiB
// Starcraft 2 enjoyer //

#include <bits/stdc++.h>

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

using namespace std;

#define LSOne(X) ((X) & -(X))

const int N = 1e3 + 5;
const int M = 1 << 10 + 5;
const int B = 18;
const long long K = 2;
const int LG = 60;
const long long INF = 1e18 + 5;
const int C = 26;
const int MOD = 1e9 + 7;

int n, m, c[N][N], q;
long long pref[N][N], suff[N][N];

inline void solve()
{
    cin >> n >> m;
    for (int x = 1; x <= n; x++)
    {
        for (int y = 1; y <= m; y++)
        {
            cin >> c[x][y];
        }
    }
    pref[1][1] = 1;
    for (int x = 1; x <= n; x++)
    {
        for (int y = 1; y <= m; y++)
        {
            if (x == 1 && y == 1)
                continue;
            if (c[x][y] == 1)
            {
                pref[x][y] = 0;
                continue;
            }
            pref[x][y] = pref[x - 1][y] + pref[x][y - 1];
            pref[x][y] %= MOD;
        }
    }
    suff[n][m] = 1;
    for (int x = n; x >= 1; x--)
    {
        for (int y = m; y >= 1; y--)
        {
            if (x == n && y == m)
                continue;
            if (c[x][y] == 1)
            {
                suff[x][y] = 0;
                continue;
            }
            suff[x][y] = suff[x + 1][y] + suff[x][y + 1];
            suff[x][y] %= MOD;
        }
    }
    cin >> q;
    for (int x = 0; x < q; x++)
    {
        int a, b;
        cin >> a >> b;
        long long cnt = suff[a][b] * pref[a][b];
        cnt %= MOD;
        // cout << cnt << " " << pref[n][m] << "\n";
        if (cnt == pref[n][m])
        {
            cout << 0 << "\n";
            continue;
        }
        cout << 1 << "\n";
        if (pref[a][b] == 0 || suff[a][b] == 0)
            continue;
        c[a][b] = 1;
        pref[a][b] = 0;
        for (int x = a; x <= n; x++)
        {
            for (int y = b; y <= m; y++)
            {
                if (x == a && y == b)
                    continue;
                if (c[x][y] == 1)
                {
                    pref[x][y] = 0;
                    continue;
                }
                pref[x][y] = pref[x - 1][y] + pref[x][y - 1];
                pref[x][y] %= MOD;
            }
        }
        suff[a][b] = 0;
        for (int x = a; x >= 1; x--)
        {
            for (int y = b; y >= 1; y--)
            {
                if (x == a && y == b)
                    continue;
                if (c[x][y] == 1)
                {
                    suff[x][y] = 0;
                    continue;
                }
                suff[x][y] = suff[x + 1][y] + suff[x][y + 1];
                suff[x][y] %= MOD;
            }
        }
    }
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin >> t;
    for (int x = 1; x <= t; x++)
    {
        solve();
    }
    return 0;
}
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