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Submission #97094

# Submission time Handle Problem Language Result Execution time Memory
97094 2019-02-13T20:09:11 Z dalgerok Portals (BOI14_portals) C++14
100 / 100
 398 ms 41152 KB 
#include<bits/stdc++.h>
using namespace std;


const int N = 1005,
          INF = 1e9,
          dx[] = {-1, 0, 1, 0},
          dy[] = {0, -1, 0, 1};


int n, m;
char a[N][N];
int dist_to_wall[N][N], d[N][N];
int sx, sy, tx, ty;
pair < int, int > nxt[4][N][N];

inline bool is_wall(int x, int y){
    return x < 1 || x > n || y < 1 || y > m || a[x][y] == '#';
}

void walls(){
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            dist_to_wall[i][j] = INF;
        }
    }
    queue < pair < int, int > > q;
    for(int i = 0; i <= n + 1; i++){
        for(int j = 0; j <= m + 1; j++){
            if(is_wall(i, j)){
                dist_to_wall[i][j] = 0;
                q.push(make_pair(i, j));
            }
        }
    }
    while(!q.empty()){
        int x = q.front().first,
            y = q.front().second;
        q.pop();
        for(int i = 0; i < 4; i++){
            int xx = x + dx[i],
                yy = y + dy[i];
            if(is_wall(xx, yy)){
                continue;
            }
            if(dist_to_wall[xx][yy] > dist_to_wall[x][y] + 1){
                dist_to_wall[xx][yy] = dist_to_wall[x][y] + 1;
                q.push(make_pair(xx, yy));
            }
        }
    }
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> a[i][j];
        }
    }
    walls();
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            if(j == 1 || a[i][j - 1] == '#'){
                nxt[0][i][j] = make_pair(i, j);
            }
            else{
                nxt[0][i][j] = nxt[0][i][j - 1];
            }
            if(i == 1 || a[i - 1][j] == '#'){
                nxt[1][i][j] = make_pair(i, j);
            }
            else{
                nxt[1][i][j] = nxt[1][i - 1][j];
            }
        }
    }
    for(int i = n; i >= 1; i--){
        for(int j = m; j >= 1; j--){
            if(j == m || a[i][j + 1] == '#'){
                nxt[2][i][j] = make_pair(i, j);
            }
            else{
                nxt[2][i][j] = nxt[2][i][j + 1];
            }
            if(i == n || a[i + 1][j] == '#'){
                nxt[3][i][j] = make_pair(i, j);
            }
            else{
                nxt[3][i][j] = nxt[3][i + 1][j];
            }
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            d[i][j] = INF;
            if(a[i][j] == 'S'){
                sx = i;
                sy = j;
            }
            else if(a[i][j] == 'C'){
                tx = i;
                ty = j;
            }
        }
    }
    /**for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cout << dist_to_wall[i][j] << " ";
        }
        cout << "\n";
    }*/
    priority_queue < pair < int, pair < int, int > > > q;
    d[sx][sy] = 0;
    q.push(make_pair(0, make_pair(sx, sy)));
    while(!q.empty()){
        int val = -q.top().first,
            x = q.top().second.first,
            y = q.top().second.second;
        q.pop();
        if(d[x][y] < val){
            continue;
        }
        for(int i = 0; i < 4; i++){
            int xx = x + dx[i],
                yy = y + dy[i];
            if(!is_wall(xx, yy) && d[xx][yy] > d[x][y] + 1){
                d[xx][yy] = d[x][y] + 1;
                q.push(make_pair(-d[xx][yy], make_pair(xx, yy)));
            }
        }
        for(int i = 0; i < 4; i++){
            int xx = nxt[i][x][y].first,
                yy = nxt[i][x][y].second;
            if(d[xx][yy] > d[x][y] + dist_to_wall[x][y]){
                d[xx][yy] = d[x][y] + dist_to_wall[x][y];
                q.push(make_pair(-d[xx][yy], make_pair(xx, yy)));
            }
        }
    }
    cout << d[tx][ty];
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 640 KB Output is correct
3 Correct 2 ms 640 KB Output is correct
4 Correct 2 ms 512 KB Output is correct
5 Correct 3 ms 640 KB Output is correct
6 Correct 2 ms 640 KB Output is correct
7 Correct 2 ms 640 KB Output is correct
8 Correct 3 ms 640 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 3 ms 512 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 512 KB Output is correct
3 Correct 2 ms 640 KB Output is correct
4 Correct 2 ms 512 KB Output is correct
5 Correct 2 ms 640 KB Output is correct
6 Correct 2 ms 640 KB Output is correct
7 Correct 3 ms 640 KB Output is correct
8 Correct 4 ms 640 KB Output is correct
9 Correct 3 ms 1664 KB Output is correct
10 Correct 4 ms 1792 KB Output is correct
11 Correct 3 ms 1664 KB Output is correct
12 Correct 4 ms 1664 KB Output is correct
13 Correct 4 ms 1664 KB Output is correct
14 Correct 2 ms 512 KB Output is correct
15 Correct 4 ms 1664 KB Output is correct
16 Correct 2 ms 460 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 3 ms 640 KB Output is correct
3 Correct 3 ms 640 KB Output is correct
4 Correct 2 ms 640 KB Output is correct
5 Correct 15 ms 6712 KB Output is correct
6 Correct 18 ms 6732 KB Output is correct
7 Correct 15 ms 6688 KB Output is correct
8 Correct 13 ms 6684 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 640 KB Output is correct
3 Correct 2 ms 640 KB Output is correct
4 Correct 3 ms 512 KB Output is correct
5 Correct 3 ms 640 KB Output is correct
6 Correct 2 ms 640 KB Output is correct
7 Correct 2 ms 640 KB Output is correct
8 Correct 2 ms 640 KB Output is correct
9 Correct 4 ms 1664 KB Output is correct
10 Correct 4 ms 1664 KB Output is correct
11 Correct 4 ms 1664 KB Output is correct
12 Correct 4 ms 1664 KB Output is correct
13 Correct 4 ms 1664 KB Output is correct
14 Correct 17 ms 6712 KB Output is correct
15 Correct 15 ms 6704 KB Output is correct
16 Correct 20 ms 6688 KB Output is correct
17 Correct 13 ms 6744 KB Output is correct
18 Correct 16 ms 6744 KB Output is correct
19 Correct 17 ms 6656 KB Output is correct
20 Correct 20 ms 6656 KB Output is correct
21 Correct 14 ms 6712 KB Output is correct
22 Correct 13 ms 6708 KB Output is correct
23 Correct 14 ms 6708 KB Output is correct
24 Correct 15 ms 6656 KB Output is correct
25 Correct 2 ms 512 KB Output is correct
26 Correct 4 ms 1664 KB Output is correct
27 Correct 2 ms 512 KB Output is correct
28 Correct 11 ms 6684 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 612 KB Output is correct
3 Correct 2 ms 640 KB Output is correct
4 Correct 3 ms 512 KB Output is correct
5 Correct 3 ms 640 KB Output is correct
6 Correct 2 ms 640 KB Output is correct
7 Correct 2 ms 640 KB Output is correct
8 Correct 2 ms 640 KB Output is correct
9 Correct 4 ms 1664 KB Output is correct
10 Correct 4 ms 1664 KB Output is correct
11 Correct 4 ms 1664 KB Output is correct
12 Correct 4 ms 1664 KB Output is correct
13 Correct 3 ms 1664 KB Output is correct
14 Correct 12 ms 6712 KB Output is correct
15 Correct 14 ms 6704 KB Output is correct
16 Correct 14 ms 6688 KB Output is correct
17 Correct 13 ms 6744 KB Output is correct
18 Correct 15 ms 6744 KB Output is correct
19 Correct 15 ms 6656 KB Output is correct
20 Correct 14 ms 6656 KB Output is correct
21 Correct 13 ms 6712 KB Output is correct
22 Correct 13 ms 6708 KB Output is correct
23 Correct 13 ms 6708 KB Output is correct
24 Correct 241 ms 40796 KB Output is correct
25 Correct 398 ms 41152 KB Output is correct
26 Correct 381 ms 40952 KB Output is correct
27 Correct 393 ms 40908 KB Output is correct
28 Correct 231 ms 40880 KB Output is correct
29 Correct 265 ms 40856 KB Output is correct
30 Correct 291 ms 41000 KB Output is correct
31 Correct 16 ms 6656 KB Output is correct
32 Correct 321 ms 40824 KB Output is correct
33 Correct 2 ms 512 KB Output is correct
34 Correct 4 ms 1664 KB Output is correct
35 Correct 254 ms 40884 KB Output is correct
36 Correct 2 ms 512 KB Output is correct
37 Correct 10 ms 6684 KB Output is correct
38 Correct 147 ms 40768 KB Output is correct
39 Correct 192 ms 40980 KB Output is correct