Submission #1038517

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038517		vjudge1	Furniture (JOI20_furniture)	C++17	100 / 100	175 ms	13140 KiB

furniture

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pf push_front
#define fi first
#define se second
const ll mod = 1e9+7, mxn = 1007;
bool blocked[mxn][mxn];
ll dia[mxn<<1], n, m;
void block(ll i, ll j)
{
    blocked[i][j] = 1; dia[i+j]--;
    if ((i-1 >= 1 && !blocked[i-1][j])) 
    {
        if (i-1 >= 1 && j+1 <= m) {if (blocked[i-1][j+1]) block(i-1,j);}
        else block(i-1,j);
    }
    if ((i+1 <= n && !blocked[i+1][j])) 
    {
        if (i+1 <= n && j-1 >= 1) {if (blocked[i+1][j-1]) block(i+1,j);}
        else block(i+1,j);
    }
    if ((j-1 >= 1 && !blocked[i][j-1])) 
    {
        if (i+1 <= n && j-1 >= 1) {if (blocked[i+1][j-1]) block(i,j-1);}
        else block(i,j-1);
    }
    if ((j+1 <= m && !blocked[i][j+1])) 
    {
        if (i-1 >= 1 && j+1 <= m) {if (blocked[i-1][j+1]) block(i,j+1);}
        else block(i,j+1);
    }
}
bool ck(ll i, ll j)
{
    if (dia[i+j] == 1 && !blocked[i][j]) return 0;
    if (blocked[i][j]) return 1;
    block(i,j); return 1;
}
signed main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
    cin >> n >> m; // cerr << n << ' ' << m << '\n';
    for (ll i = 1; i <= n; i++) for (ll j = 1; j <= m; j++) dia[i+j]++;
    for (ll i = 1; i <= n; i++) for (ll j = 1; j <= m; j++) {ll x; cin >> x; if (x) ck(i,j);}
    ll q; cin >> q;
    while (q--)
    {
        ll x, y; cin >> x >> y;
        if (ck(x,y)) cout << 1 << '\n';
        else cout << '0' << '\n';
    }
}

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