oj.uz

Submission #41157

# Submission time Handle Problem Language Result Execution time Memory
41157 2018-02-13T06:59:42 Z 14kg Portals (BOI14_portals) C++11
100 / 100
 920 ms 117716 KB 
#include <stdio.h>
#include <algorithm>
#include <queue>
#include <vector>
#define N 1001
#define INF 1000000000

using namespace std;
typedef pair<int,pair<int,int> > pip;
int n, m, board[N][N], go[N][N], d[N][N];
int dx[4]={1,-1,0,0}, dy[4]={0,0,1,-1};
bool go_check[N][N], check[N][N];
pair<int,int> S, E;
vector<pair<int,int> > p[N][N], O[1000001];
queue<int> Q;
queue<pip> PQ;

void bfs_go(){
    int ty, tx, yy, xx;
    bool w_check;

    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++){
            w_check=false;
            for(int s=0; s<4; s++){
                ty=i+dy[s], tx=j+dx[s];
                if(ty<1 || ty>n || tx<1 || tx>m) w_check=true;
                else if(board[ty][tx]) w_check=true;
            }
            if(w_check){
                go_check[i][j]=true, Q.push(i), Q.push(j);
            }
        }

    while(!Q.empty()){
        yy=Q.front(), Q.pop();
        xx=Q.front(), Q.pop();

        for(int i=0; i<4; i++){
            ty=yy+dy[i], tx=xx+dx[i];
            if(1<=ty && ty<=n && 1<=tx && tx<=m && go_check[ty][tx]==false && board[ty][tx]==0){
                go[ty][tx]=go[yy][xx]+1, go_check[ty][tx]=true;
                Q.push(ty), Q.push(tx);
            }
        }
    }
}
void Push(){
    pair<int,int> temp;

    for(int i=1; i<=n; i++){
        temp={i,1};
        for(int j=1; j<=m; j++){
            if(board[i][j]) temp={i,j+1};
            else p[i][j].push_back(temp);
        }
    }
    for(int i=1; i<=n; i++){
        temp={i,m};
        for(int j=m; j>=1; j--){
            if(board[i][j]) temp={i,j-1};
            else p[i][j].push_back(temp);
        }
    }
    for(int j=1; j<=m; j++){
        temp={1,j};
        for(int i=1; i<=n; i++){
            if(board[i][j]) temp={i+1,j};
            else p[i][j].push_back(temp);
        }
    }
    for(int j=1; j<=m; j++){
        temp={n,j};
        for(int i=n; i>=1; i--){
            if(board[i][j]) temp={i-1,j};
            else p[i][j].push_back(temp);
        }
    }
}
void PQ_push(int yy, int xx){
    int ty, tx;

    if(check[yy][xx]) return;
    check[yy][xx]=true;

    for(int i=0; i<4; i++){
        ty=yy+dy[i], tx=xx+dx[i];
        if(1<=ty && ty<=n && 1<=tx && tx<=m && d[ty][tx]>d[yy][xx]+1 && board[ty][tx]==0){
            d[ty][tx]=d[yy][xx]+1;
            PQ.push({d[ty][tx],{ty,tx}});
        }
    }
    for(vector<pair<int,int> >::iterator it=p[yy][xx].begin(); it!=p[yy][xx].end(); it++){
        ty=it->first, tx=it->second;
        if(d[ty][tx]>d[yy][xx]+go[yy][xx]+1){
            d[ty][tx]=d[yy][xx]+go[yy][xx]+1;
            O[d[ty][tx]].push_back({ty,tx});
        }
    }
}
int main(){
    char in[1005];

    scanf("%d %d",&n,&m);
    for(int i=1; i<=n; i++){
        scanf("%s",in+1);
        for(int j=1; j<=m; j++)
            if(in[j]=='#') board[i][j]=1;
            else if(in[j]=='S') S={i,j};
            else if(in[j]=='C') E={i,j};
    }

    bfs_go(), Push();
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++) d[i][j]=INF;

    PQ.push({0,{S.first,S.second}}), d[S.first][S.second]=0;
    for(int k=0; !check[E.first][E.second]; k++){
        while(PQ.empty()==false && PQ.front().first==k){
            PQ_push(PQ.front().second.first,PQ.front().second.second), PQ.pop();
        }
        for(vector<pair<int,int> >::iterator it=O[k].begin(); it!=O[k].end(); it++){
            PQ_push(it->first,it->second);
        }
    }
    printf("%d",d[E.first][E.second]);
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:104:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
                         ^
portals.cpp:106:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",in+1);
                         ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 47352 KB Output is correct
2 Correct 38 ms 47436 KB Output is correct
3 Correct 38 ms 47532 KB Output is correct
4 Correct 38 ms 47532 KB Output is correct
5 Correct 38 ms 47712 KB Output is correct
6 Correct 39 ms 47712 KB Output is correct
7 Correct 38 ms 47712 KB Output is correct
8 Correct 38 ms 47712 KB Output is correct
9 Correct 38 ms 47712 KB Output is correct
10 Correct 38 ms 47712 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 47712 KB Output is correct
2 Correct 38 ms 47712 KB Output is correct
3 Correct 39 ms 47712 KB Output is correct
4 Correct 38 ms 47788 KB Output is correct
5 Correct 39 ms 47816 KB Output is correct
6 Correct 39 ms 47816 KB Output is correct
7 Correct 46 ms 47816 KB Output is correct
8 Correct 37 ms 47816 KB Output is correct
9 Correct 39 ms 48348 KB Output is correct
10 Correct 39 ms 48348 KB Output is correct
11 Correct 38 ms 48348 KB Output is correct
12 Correct 39 ms 48348 KB Output is correct
13 Correct 39 ms 48348 KB Output is correct
14 Correct 38 ms 48348 KB Output is correct
15 Correct 39 ms 48348 KB Output is correct
16 Correct 38 ms 48348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 48348 KB Output is correct
2 Correct 38 ms 48348 KB Output is correct
3 Correct 42 ms 48348 KB Output is correct
4 Correct 38 ms 48348 KB Output is correct
5 Correct 51 ms 50836 KB Output is correct
6 Correct 53 ms 50836 KB Output is correct
7 Correct 51 ms 50924 KB Output is correct
8 Correct 49 ms 50924 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 50924 KB Output is correct
2 Correct 39 ms 50924 KB Output is correct
3 Correct 40 ms 50924 KB Output is correct
4 Correct 40 ms 50924 KB Output is correct
5 Correct 39 ms 50924 KB Output is correct
6 Correct 40 ms 50924 KB Output is correct
7 Correct 39 ms 50924 KB Output is correct
8 Correct 39 ms 50924 KB Output is correct
9 Correct 40 ms 50924 KB Output is correct
10 Correct 50 ms 50924 KB Output is correct
11 Correct 47 ms 50924 KB Output is correct
12 Correct 47 ms 50924 KB Output is correct
13 Correct 40 ms 50924 KB Output is correct
14 Correct 67 ms 50924 KB Output is correct
15 Correct 54 ms 50924 KB Output is correct
16 Correct 51 ms 50924 KB Output is correct
17 Correct 59 ms 51564 KB Output is correct
18 Correct 58 ms 51948 KB Output is correct
19 Correct 63 ms 51948 KB Output is correct
20 Correct 57 ms 52304 KB Output is correct
21 Correct 53 ms 52304 KB Output is correct
22 Correct 52 ms 52304 KB Output is correct
23 Correct 55 ms 52304 KB Output is correct
24 Correct 56 ms 52332 KB Output is correct
25 Correct 38 ms 52332 KB Output is correct
26 Correct 40 ms 52332 KB Output is correct
27 Correct 39 ms 52332 KB Output is correct
28 Correct 50 ms 52332 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 52332 KB Output is correct
2 Correct 38 ms 52332 KB Output is correct
3 Correct 39 ms 52332 KB Output is correct
4 Correct 44 ms 52332 KB Output is correct
5 Correct 39 ms 52332 KB Output is correct
6 Correct 42 ms 52332 KB Output is correct
7 Correct 38 ms 52332 KB Output is correct
8 Correct 38 ms 52332 KB Output is correct
9 Correct 41 ms 52332 KB Output is correct
10 Correct 39 ms 52332 KB Output is correct
11 Correct 39 ms 52332 KB Output is correct
12 Correct 42 ms 52332 KB Output is correct
13 Correct 40 ms 52332 KB Output is correct
14 Correct 52 ms 52332 KB Output is correct
15 Correct 51 ms 52332 KB Output is correct
16 Correct 51 ms 52332 KB Output is correct
17 Correct 52 ms 52332 KB Output is correct
18 Correct 54 ms 52332 KB Output is correct
19 Correct 52 ms 52332 KB Output is correct
20 Correct 54 ms 52332 KB Output is correct
21 Correct 51 ms 52332 KB Output is correct
22 Correct 52 ms 52332 KB Output is correct
23 Correct 56 ms 52332 KB Output is correct
24 Correct 623 ms 98600 KB Output is correct
25 Correct 822 ms 108524 KB Output is correct
26 Correct 634 ms 108524 KB Output is correct
27 Correct 785 ms 113428 KB Output is correct
28 Correct 588 ms 113428 KB Output is correct
29 Correct 586 ms 113428 KB Output is correct
30 Correct 582 ms 113428 KB Output is correct
31 Correct 55 ms 113428 KB Output is correct
32 Correct 920 ms 117716 KB Output is correct
33 Correct 40 ms 117716 KB Output is correct
34 Correct 41 ms 117716 KB Output is correct
35 Correct 605 ms 117716 KB Output is correct
36 Correct 39 ms 117716 KB Output is correct
37 Correct 49 ms 117716 KB Output is correct
38 Correct 598 ms 117716 KB Output is correct
39 Correct 419 ms 117716 KB Output is correct