Submission #1019705

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019705		cpptowin	Furniture (JOI20_furniture)	C++17	0 / 100	1 ms	860 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 r[N][N],cnt[maxn];
int solve(int i,int j)
{
    if(r[i][j])  return 1;
    if(cnt[i + j] == 1) return 0;
    stack<pii> q;
    if(!r[i][j])
    {
        q.emplace(i,j);
        r[i][j] = 1;
        cnt[i + j]--;
    }
    while(ss(q))
    {
        auto [x,y] = q.top();
        q.pop();
        if(r[x - 1][y + 1])
        {
            if(!r[x - 1][y])
            {
                r[x - 1][y] = 1;
                cnt[x + y - 1]--;
                q.emplace(x - 1,y);
            }
            if(!r[x][y + 1])
            {
                r[x][y + 1] = 1;
                cnt[x + y + 1]--;
                q.emplace(x,y + 1);
            }
        }
        if(r[x + 1][y - 1])
        {
            if(!r[x][y - 1])
            {
                r[x][y - 1] = 1;
                cnt[x + y - 1]--;
                q.emplace(x,y - 1);
            }
            if(!r[x + 1][y])
            {
                r[x + 1][y] = 1;
                cnt[x + y + 1]--;
                q.emplace(x + 1,y);
            }
        }
    }
    return 1;
}
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) cnt[i + j]++;
    fo(i,1,n) fo(j,1,m)
    {
        int x;
        cin >> x;
        if(x == 1) solve(i,j);
    }
    cin >> q;
    while(q--)
    {
        int i,j;
        cin >> i >> j;
        cout << solve(i,j);
        en;
    }
}

Compilation message (stderr)

furniture.cpp:70:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   70 | main()
      | ^~~~
furniture.cpp: In function 'int main()':
furniture.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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