Submission #879820

#	Time	Username	Problem	Language	Result	Execution time	Memory
879820		1075508020060209tc	Portal (COCI17_portal)	C++14	72 / 120	50 ms	9052 KiB

portal

//#pragma gcc optimize("O2")
#include <bits/stdc++.h>
//#include<complex>
using namespace std;
#define int long long
int n;int m;
string gr[510];
int dir[5]={0,1,0,-1,0};
int odis[510][510];
int dis[510][510];
int bsd(int x,int y){
for(int d=1;d<=4;d++){
    int a=x+dir[d-1];int b=y+dir[d];
    if(gr[a][b]=='#'){return 1;}
}
return 0;
}

void fbfs(){
queue<pair<int,int>>q;
for(int i=1;i<=n;i++){
    for(int j=1;j<=n;j++){
            odis[i][j]=1e9;
        if(gr[i][j]!='#'&&bsd(i,j)){
            q.push({i,j});
            odis[i][j]=0;
        }
    }
}

while(q.size()){
    int nwx=q.front().first;
    int nwy=q.front().second;
    q.pop();
    for(int i=1;i<=4;i++){
        int x=nwx+dir[i-1];int y=nwy+dir[i];
        if(gr[x][y]=='#'){continue;}
        if(odis[x][y]>odis[nwx][nwy]+1){
            odis[x][y]=odis[nwx][nwy]+1;
            q.push({x,y});
        }
    }
}


}
int vis[510][510];
signed main(){
cin>>n>>m;
for(int i=1;i<=n;i++){
    cin>>gr[i];
    gr[i]="#"+gr[i]+"#";
}
pair<int,int>st;
pair<int,int>en;
for(int i=1;i<=n;i++){
    for(int j=1;j<=m;j++){
        odis[i][j]=1e9;
        dis[i][j]=1e9;
        if(gr[i][j]=='C'){
            st={i,j};
        //    pq.push_back({{i,j},0});
        }
        if(gr[i][j]=='F'){
            en={i,j};
        }
    }
}
fbfs();

priority_queue<pair<int,pair<int,int>>,vector<pair<int,pair<int,int>>>,greater<pair<int,pair<int,int>>>>pq;
pq.push({0,st});
dis[st.first][st.second]=0;
while(pq.size()){
    int nwx=pq.top().second.first;
    int nwy=pq.top().second.second;
    pq.pop();
    if(vis[nwx][nwy]){continue;}
    vis[nwx][nwy]=1;
    for(int i=1;i<=4;i++){
        int x=nwx+dir[i-1];
        int y=nwy+dir[i];
        if(gr[x][y]=='#'){continue;}
        if(dis[x][y]>dis[nwx][nwy]+1){
            dis[x][y]=dis[nwx][nwy]+1;
            pq.push({dis[x][y],{x,y}});
        }

        while(gr[x+dir[i-1]][y+dir[i]]!='#'){
            x+=dir[i-1];y+=dir[i];
        }
        if(dis[x][y]>dis[nwx][nwy]+1+odis[nwx][nwy]){
            dis[x][y]=dis[nwx][nwy]+1+odis[nwx][nwy];
            pq.push({dis[x][y],{x,y}});
        }
    }
}
if(dis[en.first][en.second]>n*m){
    cout<<"nemoguce";return 0;
}
cout<<dis[en.first][en.second]<<"\n";




}

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 12 / 12
• Subtask 5: 12 / 12
• Subtask 6: 0 / 12
• Subtask 7: 0 / 12
• Subtask 8: 0 / 12
• Subtask 9: 0 / 12
• Subtask 10: 12 / 12