Submission #1360235

#TimeUsernameProblemLanguageResultExecution timeMemory
1360235iamhereforfunFurniture (JOI20_furniture)C++20
0 / 100
1 ms1092 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;
const int nx[] = {0, 1, 0, -1}, ny[] = {-1, 0, 1, 0};

int n, m, c[N][N], q, r[N][N], cnt[2 * N], num[2 * N];

void dfs(int x, int y)
{
    if(x == n && y == m)
    {
        r[x][y] = 0;
        return;
    }
    if(x == 1 && y == 1)
    {
        r[x][y] = 0;
        return;
    }
    cnt[x + y] -= r[x][y];
    if ((r[x - 1][y] & r[x][y - 1]) || (r[x + 1][y] & r[x][y + 1]))
    {
        r[x][y] = 1;
    }
    cnt[x + y] += r[x][y];
    if (!r[x][y])
        return;
    for (int i = 0; i < 4; i++)
    {
        int nnx = x + nx[i], nny = y + ny[i];
        if (nnx < 1 || nnx > n || nny < 1 || nny > m)
        {
            continue;
        }
        if (r[nnx][nny])
            continue;
        dfs(nnx, nny);
    }
}

inline void solve()
{
    cin >> n >> m;
    for (int x = 0; x <= n; x++)
    {
        r[x][m + 1] = 1;
    }
    for(int y = 0; y <= m; y++)
    {
        r[n + 1][y] = 1;
    }
    for (int x = 1; x <= n; x++)
    {
        for (int y = 1; y <= m; y++)
        {
            num[x + y]++;
            cin >> c[x][y];
        }
    }
    r[1][1] = 0;
    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)
            {
                r[x][y] = 1;
                cnt[x + y]++;
                continue;
            }
            r[x][y] = r[x - 1][y] & r[x][y - 1];
        }
    }
    for(int x = 1; x <= n; x++)
    {
        for(int y = 1; y <= m; y++)
        {
            dfs(x, y);
        }
    }
    cin >> q;
    for (int x = 0; x < q; x++)
    {
        int a, b;
        cin >> a >> b;
        if (r[a][b])
        {
            cout << 1 << "\n";
            continue;
        }
        else
        {
            if (cnt[a + b] == num[a + b] - 1)
            {
                cout << 0 << "\n";
                continue;
            }
            cout << 1 << "\n";
            r[a][b] = 1;
            cnt[a + b]++;
            dfs(a, b);
        }
    }
}

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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