Submission #540276

#	Time	Username	Problem	Language	Result	Execution time	Memory
540276		__Variatto	Portals (BOI14_portals)	C++17	20 / 100	7 ms	1812 KiB

portals

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define ll long long
const int MAX=1e3+10, MAXV=1e9+10;
int n, m, odl[MAX][MAX];
char c[MAX][MAX];
bool odw[MAX][MAX];
vector<int>w[MAX], k[MAX];
pair<int,int>kon, start;
priority_queue<pair<int,pair<int,int>>>kol;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin>>n>>m;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            cin>>c[i][j];
            if(c[i][j]=='S')
                kol.push({0, {i, j}}), start={i, j};
            if(c[i][j]=='#') 
                w[i].pb(j), k[j].pb(i);
            if(c[i][j]=='C')
                kon={i, j};
        }
    }
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++)
            odl[i][j]=MAXV;
    odl[start.fi][start.se]=0;
    for(int i=1; i<=n; i++)
        w[i].pb(0), w[i].pb(m+1);
    for(int i=1; i<=m; i++)
        k[i].pb(0), k[i].pb(n+1);
    for(int i=1; i<=n; i++)
        sort(w[i].begin(), w[i].end());
    for(int i=1; i<=m; i++)
        sort(k[i].begin(), k[i].end());
    while(kol.size()){
        auto i=kol.top().se.fi, j=kol.top().se.se;
    //    cout<<i<<" "<<j<<" "<<odl[i][j]<<"\n";
        kol.pop();
        if(i==kon.fi&&j==kon.se) break;
        if(odw[i][j]) continue;
        odw[i][j]=true;
        if((c[i-1][j]=='.'||c[i-1][j]=='C') && odl[i-1][j]>odl[i][j]+1) odl[i-1][j]=odl[i][j]+1, kol.push({-odl[i-1][j], {i-1, j}});
        if((c[i+1][j]=='.'||c[i+1][j]=='C') && odl[i+1][j]>odl[i][j]+1) odl[i+1][j]=odl[i][j]+1, kol.push({-odl[i+1][j], {i+1, j}});
        if((c[i][j-1]=='.'||c[i][j-1]=='C') && odl[i][j-1]>odl[i][j]+1) odl[i][j-1]=odl[i][j]+1, kol.push({-odl[i][j-1], {i, j-1}});
        if((c[i][j+1]=='.'||c[i][j+1]=='C') && odl[i][j+1]>odl[i][j]+1) odl[i][j+1]=odl[i][j]+1, kol.push({-odl[i][j+1], {i, j+1}});
        int prawo=lower_bound(w[i].begin(), w[i].end(), j)-w[i].begin();
        int lewo=prawo-1;
        int dol=lower_bound(k[j].begin(), k[j].end(), i)-k[j].begin();
        int gora=dol-1;
        //cout<<i<<" "<<j<<"  "<<gora<<" "<<dol<<"  "<<k[j][gora]<<" "<<k[j][dol]<<"\n";
        //continue;
        if((j-1==0 || c[i][j-1]=='#') || (j==m || c[i][j+1]=='#') || (i-1==0 || c[i-1][j]=='#') || (i==n || c[i+1][j]=='#')){
            if(odl[i][w[i][prawo]-1]>odl[i][j]+1)
                odl[i][w[i][prawo]-1]=odl[i][j]+1, kol.push({-odl[i][w[i][prawo]-1], {i, w[i][prawo]-1}});
            if(odl[i][w[i][lewo]+1]>odl[i][j]+1)
                odl[i][w[i][lewo]+1]=odl[i][j]+1, kol.push({-odl[i][w[i][lewo]+1], {i, w[i][lewo]+1}});
            if(odl[k[j][dol]-1][j]>odl[i][j]+1)
                odl[k[j][dol]-1][j]=odl[i][j]+1, kol.push({-odl[k[j][dol]-1][j], {k[j][dol]-1, j}});
            if(odl[k[j][gora]+1][j]>odl[i][j]+1)
                odl[k[j][gora]+1][j]=odl[i][j]+1, kol.push({-odl[k[j][gora]+1][j], {k[j][gora]+1, j}});
        }
/*        if(j==m || c[i][j+1]=='#')
        if(i-1==0 || c[i-1][j]=='#')
        if(i==n || c[i+1][j]=='#')
*/    }
    cout<<odl[kon.fi][kon.se]<<"\n";
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30