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Submission #512249

# Submission time Handle Problem Language Result Execution time Memory
512249 2022-01-16T08:22:11 Z 79brue None (JOI16_skating) C++14
100 / 100
 1337 ms 47004 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int xx[] = {1, 0, -1, 0};
const int yy[] = {0, 1, 0, -1};

struct dat{
    int x, y, d, w;
    dat(){}
    dat(int x, int y, int d, int w): x(x), y(y), d(d), w(w){}

    bool operator<(const dat &r)const{
        return w>r.w;
    }
};

int n, m;
bool arr[1005][1005];
int wallX[1005][1005][4], wallY[1005][1005][4];
bool visited[1005][1005][5];

int r1, c1;
int r2, c2;
priority_queue<dat> que;

void makeWall(){
    for(int i=1; i<=n; i++){
        for(int j=m; j>=1; j--){
            if(arr[i][j]) wallX[i][j][1] = i, wallY[i][j][1] = j-1;
            else wallX[i][j][1] = wallX[i][j+1][1], wallY[i][j][1] = wallY[i][j+1][1];
        }
    }
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(arr[i][j]) wallX[i][j][3] = i, wallY[i][j][3] = j+1;
            else wallX[i][j][3] = wallX[i][j-1][3], wallY[i][j][3] = wallY[i][j-1][3];
        }
    }
    for(int i=n; i>=1; i--){
        for(int j=1; j<=m; j++){
            if(arr[i][j]) wallX[i][j][0] = i-1, wallY[i][j][0] = j;
            else wallX[i][j][0] = wallX[i+1][j][0], wallY[i][j][0] = wallY[i+1][j][0];
        }
    }
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(arr[i][j]) wallX[i][j][2] = i+1, wallY[i][j][2] = j;
            else wallX[i][j][2] = wallX[i-1][j][2], wallY[i][j][2] = wallY[i-1][j][2];
        }
    }
}

void queueInsert(int x, int y, int d, int w){
    if(visited[x][y][d] || arr[x][y]) return;
    que.push(dat(x, y, d, w));
}

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            char c;
            scanf(" %c", &c);
            arr[i][j] = (c == '#');
        }
    }
    scanf("%d %d %d %d", &r1, &c1, &r2, &c2);

    makeWall();

    que.push(dat(r1, c1, 4, 0));
    while(!que.empty()){
        dat tmp = que.top(); que.pop();
        int x = tmp.x, y = tmp.y, d = tmp.d, w = tmp.w;
        if(visited[tmp.x][tmp.y][tmp.d]) continue;
        visited[tmp.x][tmp.y][tmp.d] = 1;
//        printf("%d %d %d %d\n", x, y, d, w);
        if(x == r2 && y == c2){
            printf("%d", w);
            return 0;
        }

        for(int i=0; i<4; i++){
            queueInsert(wallX[x][y][i], wallY[x][y][i], i, w+1);
            queueInsert(x+xx[i], y+yy[i], i^2, w+2);
        }
    }

    printf("-1");
}

Compilation message

skating.cpp: In function 'int main()':
skating.cpp:77:35: warning: unused variable 'd' [-Wunused-variable]
   77 |         int x = tmp.x, y = tmp.y, d = tmp.d, w = tmp.w;
      |                                   ^
skating.cpp:62:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
skating.cpp:66:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |             scanf(" %c", &c);
      |             ~~~~~^~~~~~~~~~~
skating.cpp:70:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     scanf("%d %d %d %d", &r1, &c1, &r2, &c2);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct

Subtask #2
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 20 ms 4684 KB Output is correct
12 Correct 24 ms 4956 KB Output is correct
13 Correct 10 ms 5444 KB Output is correct
14 Correct 22 ms 4424 KB Output is correct
15 Correct 4 ms 3404 KB Output is correct
16 Correct 40 ms 5432 KB Output is correct
17 Correct 28 ms 4420 KB Output is correct
18 Correct 21 ms 4428 KB Output is correct
19 Correct 29 ms 4616 KB Output is correct
20 Correct 11 ms 3896 KB Output is correct
21 Correct 15 ms 4300 KB Output is correct
22 Correct 8 ms 4172 KB Output is correct
23 Correct 29 ms 4544 KB Output is correct
24 Correct 31 ms 4532 KB Output is correct
25 Correct 16 ms 4428 KB Output is correct
26 Correct 27 ms 4580 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 20 ms 4684 KB Output is correct
12 Correct 24 ms 4956 KB Output is correct
13 Correct 10 ms 5444 KB Output is correct
14 Correct 22 ms 4424 KB Output is correct
15 Correct 4 ms 3404 KB Output is correct
16 Correct 40 ms 5432 KB Output is correct
17 Correct 28 ms 4420 KB Output is correct
18 Correct 21 ms 4428 KB Output is correct
19 Correct 29 ms 4616 KB Output is correct
20 Correct 11 ms 3896 KB Output is correct
21 Correct 15 ms 4300 KB Output is correct
22 Correct 8 ms 4172 KB Output is correct
23 Correct 29 ms 4544 KB Output is correct
24 Correct 31 ms 4532 KB Output is correct
25 Correct 16 ms 4428 KB Output is correct
26 Correct 27 ms 4580 KB Output is correct
27 Correct 556 ms 40536 KB Output is correct
28 Correct 1154 ms 47004 KB Output is correct
29 Correct 68 ms 38320 KB Output is correct
30 Correct 448 ms 45116 KB Output is correct
31 Correct 79 ms 33708 KB Output is correct
32 Correct 836 ms 38936 KB Output is correct
33 Correct 115 ms 15556 KB Output is correct
34 Correct 329 ms 37636 KB Output is correct
35 Correct 777 ms 40756 KB Output is correct
36 Correct 667 ms 39892 KB Output is correct
37 Correct 250 ms 37888 KB Output is correct
38 Correct 1337 ms 46884 KB Output is correct
39 Correct 360 ms 38536 KB Output is correct
40 Correct 173 ms 38344 KB Output is correct