Submission #1142891

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142891		guagua0407	Furniture (JOI20_furniture)	C++20	0 / 100	1 ms	2116 KiB

furniture

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=1005;
int a[mxn][mxn];
int ok[mxn*2];
int cnt[mxn][mxn];
bool vis[mxn][mxn];
int in[mxn][mxn];
int out[mxn][mxn];

int main() {_
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
        }
    }
    {
        queue<pair<int,int>> q;
        if(a[n][m]==0){
            vis[n][m]=true;
            q.push({n,m});
        }
        while(!q.empty()){
            auto [x,y]=q.front();
            q.pop();
            if(x>1){
                if(a[x-1][y]==0){
                    in[x-1][y]++;
                    if(!vis[x-1][y]){
                        vis[x-1][y]=true;
                        q.push({x-1,y});
                    }
                }
            }
            if(y>1){
                if(a[x][y-1]==0){
                    in[x][y-1]++;
                    if(!vis[x][y-1]){
                        vis[x][y-1]=true;
                        q.push({x,y-1});
                    }
                }
            }
        }
        for(int i=1;i<=n;i++){
            for(int j=1;j<=m;j++){
                if(vis[i][j]) cnt[i][j]++;
                vis[i][j]=false;
            }
         }
    }
    {
        queue<pair<int,int>> q;
        if(a[1][1]==0){
            vis[1][1]=true;
            q.push({1,1});
        }
        while(!q.empty()){
            auto [x,y]=q.front();
            q.pop();
            if(x<n){
                if(a[x+1][y]==0){
                    out[x+1][y]++;
                    if(!vis[x+1][y]){
                        vis[x+1][y]=true;
                        q.push({x+1,y});
                    }
                }
            }
            if(y<m){
                if(a[x][y+1]==0){
                    out[x][y+1]++;
                    if(!vis[x][y+1]){
                        vis[x][y+1]=true;
                        q.push({x,y+1});
                    }
                }
            }
        }
        for(int i=1;i<=n;i++){
            for(int j=1;j<=m;j++){
                if(vis[i][j]) cnt[i][j]++;
                vis[i][j]=false;
            }
         }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(cnt[i][j]==2) ok[i+j]++;
        }
    }
    int ans=0;
    for(int i=1+1;i<=n+m;i++){
        if(ok[i]>0) ans++;
    }
    int sz=(n+m)-(1+1)+1;
    int q;
    cin>>q;
    for(int t=0;t<q;t++){
        int x,y;
        cin>>x>>y;
        if(ans<sz){
            cout<<0<<'\n';
            continue;
        }
        if(cnt[x][y]==2 and ok[x+y]==1){
            cout<<0<<'\n';
            continue;
        }
        cout<<1<<'\n';
        if(cnt[x][y]<2) continue;
        queue<pair<int,int>> q;
        cnt[x][y]--;
        ok[x+y]--;
        if(ok[x+y]==0) ans--;
        q.push({x,y});
        while(!q.empty()){
            auto [x,y]=q.front();
            q.pop();
            if(x<n){
                if(cnt[x+1][y]==2){
                    out[x+1][y]--;
                    if(out[x+1][y]==0){
                        cnt[x+1][y]--;
                        ok[x+1+y]--;
                        if(ok[x+1+y]==0) ans--;
                        q.push({x+1,y});
                    }
                }
            }
            if(y<m){
                if(cnt[x][y+1]==2){
                    out[x][y+1]--;
                    if(out[x][y+1]==0){
                        cnt[x][1]--;
                        ok[x+y+1]--;
                        if(ok[x+y+1]==0) ans--;
                        q.push({x,y+1});
                    }
                }
            }
            if(x>1){
                if(cnt[x-1][y]==2){
                    in[x-1][y]--;
                    if(in[x-1][y]==0){
                        cnt[x-1][y]--;
                        ok[x-1+y]--;
                        if(ok[x-1+y]==0) ans--;
                        q.push({x-1,y});
                    }
                }
            }
            if(y>1){
                if(cnt[x][y-1]==2){
                    in[x][y-1]--;
                    if(in[x][y-1]==0){
                        cnt[x][y-1]--;
                        ok[x+y-1]--;
                        if(ok[x+y-1]==0) ans--;
                        q.push({x,y-1});
                    }
                }
            }
        }
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz

Compilation message (stderr)

furniture.cpp: In function 'void setIO(std::string)':
furniture.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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