Submission #1019574

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019574		cpptowin	Furniture (JOI20_furniture)	C++17	0 / 100	2 ms	2908 KiB

furniture

#include<bits/stdc++.h>
#define fo(i,l,r) for(int i = l ; i <= r ; i++)
#define fod(i,r,l) for(int i = r ; i >= l ; i--)
#define pb emplace_back
#define maxn 1000010
#define N 1010
#define int long long
#define ss(x) (int) x.size()
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define vii vector<pii>
#define en cout << "\n";
#define bit(x,i) ((x >> i) & 1)
#define bitcount(x) __builtint_popcount(x)
#define onbit(x,i) (x | (1ll << i))
#define offbit(x,i) (x ^ (1ll << i))
#define inf (int)1e18
#define lb(x) x & (-x)
using namespace std;
int n,m,q;
int a[N][N],r[N][N],cnt[maxn];
main()
{
#define name "TASK"
    if(fopen(name".inp","r"))
    {
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    fo(i,1,n) fo(j,1,m) cin >> a[i][j],r[i][j] = a[i][j];
    fo(i,1,n) fo(j,1,m) if(!r[i][j] and i * j != 1 and i * j != n * m)
    {
        bool ok = 1;
        if(i > 1 and !r[i - 1][j]) ok = 0;
        if(j > 1 and !r[i][j - 1]) ok = 0;
        r[i][j] = ok;
    }
    fod(i,n,1) fod(j,m,1) if(!r[i][j] and i * j != 1 and i * j != n * m)
    {
        bool ok = 1;
        if(i < n and !r[i + 1][j]) ok = 0;
        if(j < m and !r[i][j + 1]) ok = 0;
        r[i][j] = ok;
    }
    fo(i,1,n) fo(j,1,m) if(!r[i][j]) cnt[i + j]++;
    cin >> q;
    while(q--)
    {
        int i,j;
        cin >> i >> j;
        if(r[i][j] == 1) cout << 1 << "\n";
        else
        {
            if(cnt[i + j] > 1)
            {
                cout << 1 << "\n";
                stack<pii> q;
                q.push({i,j});
                while(ss(q))
                {
                    auto [x,y] = q.top();
                    r[x][y] = 1;
                    cnt[x + y]--;
                    q.pop();
                    if(r[x - 1][y + 1])
                    {
                        if(!r[x][y + 1])
                        q.push({x,y + 1});
                        if(!r[x - 1][y])
                        q.push({x - 1,y});
                    }
                    if(r[x + 1][y - 1])
                    {
                        if(!r[x][y - 1])
                        q.push({x,y - 1});
                        if(!r[x + 1][y])
                        q.push({x + 1,y});
                    }
                }
            }
            else  cout << 0 << "\n";
        }
    }
}

Compilation message (stderr)

furniture.cpp:22:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | main()
      | ^~~~
furniture.cpp: In function 'int main()':
furniture.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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