Submission #421068

#	Time	Username	Problem	Language	Result	Execution time	Memory
421068		inwbear	Furniture (JOI20_furniture)	C++14	0 / 100	0 ms	204 KiB

furniture

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define MEM(x,a) memset((x),a,sizeof((x)))
#define F first
#define S second
#define imx INT_MAX
const long long MOD = (long long)(1e9+7);
const long long MMX = (long long)(1e18);
typedef long long LL;
typedef pair<int,int> pii;
int n,m,q,xi,xj,co[1005][1005][2],k,fur[1005][1005],mi;
bool cc;
queue<pair<int,int> >qq;
int main()
{
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
    scanf("%d %d",&n,&m);
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            scanf("%d",&fur[i][j]);
        }
    }
    co[1][1][0]=1;
    co[n][m][1]=1;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            if(fur[i][j]==1||co[i][j][0]==0)continue;
            if(fur[i+1][j]==0)co[i+1][j][0]++;
            if(fur[i][j+1]==0)co[i][j+1][0]++;
        }
    }
    for(int i=n;i>0;i--)
    {
        for(int j=m;j>0;j--)
        {
            if(fur[i][j]==1||co[i][j][1]==0)continue;
            if(fur[i-1][j]==0)co[i-1][j][1]++;
            if(fur[i][j-1]==0)co[i][j-1][1]++;
        }
    }
    scanf("%d",&q);
    while(q--)
    {
        cc=false;
        scanf("%d %d",&xi,&xj);
        co[1][1][0]=1;
        co[n][m][1]=1;
        for(int i=1;i<=n;i++)
        {
            for(int j=1;j<=m;j++)
            {
                if(fur[i][j]==1||co[i][j][0]==0)continue;
                if(fur[i+1][j]==0)co[i+1][j][0]++;
                if(fur[i][j+1]==0)co[i][j+1][0]++;
            }
        }
        for(int i=n;i>0;i--)
        {
            for(int j=m;j>0;j--)
            {
                if(fur[i][j]==1||co[i][j][1]==0)continue;
                if(fur[i-1][j]==0)co[i-1][j][1]++;
                if(fur[i][j-1]==0)co[i][j-1][1]++;
            }
        }
        mi=1;
        for(int i=xi-1;i>0;i--)
        {
            if(fur[i][xj]==1)mi=0;
            if(co[i][xj][0]>0&&co[i][xj][1]-mi>0)cc=true;
        }
        for(int j=xj-1;j>0;j--)
        {
            if(fur[xi][j]==1)mi=0;
            if(co[xi][j][0]>0&&co[xi][j][1]-mi>0)cc=true;
        }
        for(int i=xi+1;i<=n;i++)
        {
            if(fur[i][xj]==1)mi=0;
            if(co[i][xj][0]>0&&co[i][xj][1]-mi>0)cc=true;
        }
        for(int j=xj+1;j<=m;j++)
        {
            if(fur[xi][j]==1)mi=0;
            if(co[xi][j][0]>0&&co[xi][j][1]-mi>0)cc=true;
        }
        if(cc)
        {
            printf("1\n");
            fur[xi][xj]=1;
            qq.push({xi,xj});
            while(!qq.empty())
            {
                if(qq.front().F+1<=n)
                {
                    co[qq.front().F+1][qq.front().S][0]--;
                    if(co[qq.front().F+1][qq.front().S][0]==0)
                    {
                        qq.push({qq.front().F+1,qq.front().S});
                    }
                }
                if(qq.front().S+1<=m)
                {
                    co[qq.front().F][qq.front().S+1][0]--;
                    if(co[qq.front().F][qq.front().S+1][0]==0)
                    {
                        qq.push({qq.front().F,qq.front().S+1});
                    }
                }
                qq.pop();
            }
            qq.push({xi,xj});
            while(!qq.empty())
            {
                if(qq.front().F-1>0)
                {
                    co[qq.front().F-1][qq.front().S][1]--;
                    if(co[qq.front().F-1][qq.front().S][1]==0)
                    {
                        qq.push({qq.front().F-1,qq.front().S});
                    }
                }
                if(qq.front().S-1>0)
                {
                    co[qq.front().F][qq.front().S-1][1]--;
                    if(co[qq.front().F][qq.front().S-1][1]==0)
                    {
                        qq.push({qq.front().F,qq.front().S-1});
                    }
                }
                qq.pop();
            }
        }
        else printf("0\n");
    }
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen("in.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
furniture.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("out.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
furniture.cpp:25:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |             scanf("%d",&fur[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~~
furniture.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     scanf("%d",&q);
      |     ~~~~~^~~~~~~~~
furniture.cpp:52:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         scanf("%d %d",&xi,&xj);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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