oj.uz

Submission #843966

# Submission time Handle Problem Language Result Execution time Memory
843966 2023-09-04T18:10:57 Z mickey080929 None (JOI16_skating) C++17
100 / 100
 68 ms 43108 KB 
#include <bits/stdc++.h>

#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;

const int inf = 1e9;

int n, m;
int sx, sy, ex, ey;
int A[1010][1010];
pii L[1010][1010], R[1010][1010], U[1010][1010], D[1010][1010];
int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};
int vis[1010][1010];
char in[2000010];

int main() {
    fread(in, 1, sizeof(in), stdin);
    int T = 0;
    for (T=0; in[T] != ' '; T++) n = n * 10 + in[T] - '0';
    for (T++; in[T] != '\n'; T++) m = m * 10 + in[T] - '0';
    for (int i=1; i<=n; i++) {
        for (int j=1; j<=m; j++) {
            T ++;
            if (in[T] == '#') A[i][j] = 0;
            else A[i][j] = 1;
        }
        T ++;
    }
    for (T++; in[T] != ' '; T++) sx = sx * 10 + in[T] - '0';
    for (T++; in[T] != '\n'; T++) sy = sy * 10 + in[T] - '0';
    for (T++; in[T] != ' '; T++) ex = ex * 10 + in[T] - '0';
    for (T++; in[T] != '\n'; T++) ey = ey * 10 + in[T] - '0';
    for (int i=1; i<=n; i++) {
        int p = 1;
        for (int j=2; j<=m; j++) {
            if (!A[i][j]) p = j;
            else L[i][j] = {i, p+1};
        }
        p = m;
        for (int j=m-1; j>=1; j--) {
            if (!A[i][j]) p = j;
            else R[i][j] = {i, p-1};
        }
    }
    for (int j=1; j<=m; j++) {
        int p = 1;
        for (int i=2; i<=n; i++) {
            if (!A[i][j]) p = i;
            else U[i][j] = {p+1, j};
        }
        p = n;
        for (int i=n-1; i>=1; i--) {
            if (!A[i][j]) p = i;
            else D[i][j] = {p-1, j};
        }
    }
    vector<pii> q1, q2, q3;
    q1.push_back({sx, sy});
    vis[sx][sy] = 1;
    int t = 0;
    while (!q1.empty() || !q2.empty()) {
        for (auto &[x, y] : q1) {
            if (x == ex && y == ey) {
                printf("%d\n", t);
                return 0;
            }
            for (auto &[nx, ny] : {L[x][y], R[x][y], U[x][y], D[x][y]}) {
                if (vis[nx][ny]) continue;
                vis[nx][ny] = 1;
                q2.push_back({nx, ny});
            }
        }
        for (auto &[x, y] : q1) {
            for (int i=0; i<4; i++) {
                int nx = x + dx[i];
                int ny = y + dy[i];
                if (!A[nx][ny]) continue;
                if (vis[nx][ny]) continue;
                vis[nx][ny] = 1;
                q3.push_back({nx, ny});
            }
        }
        q1 = q2;
        q2 = q3;
        q3.clear();
        t ++;
    }
    printf("-1\n");
}

Compilation message

skating.cpp: In function 'int main()':
skating.cpp:24:10: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     fread(in, 1, sizeof(in), stdin);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 1 ms 12632 KB Output is correct
3 Correct 1 ms 12636 KB Output is correct
4 Correct 2 ms 12632 KB Output is correct
5 Correct 1 ms 12632 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 1 ms 12632 KB Output is correct
9 Correct 2 ms 12632 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct

Subtask #2
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 1 ms 12632 KB Output is correct
3 Correct 1 ms 12636 KB Output is correct
4 Correct 2 ms 12632 KB Output is correct
5 Correct 1 ms 12632 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 1 ms 12632 KB Output is correct
9 Correct 2 ms 12632 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 3 ms 21080 KB Output is correct
12 Correct 4 ms 21336 KB Output is correct
13 Correct 3 ms 21592 KB Output is correct
14 Correct 5 ms 21340 KB Output is correct
15 Correct 3 ms 20824 KB Output is correct
16 Correct 4 ms 21596 KB Output is correct
17 Correct 4 ms 21084 KB Output is correct
18 Correct 4 ms 21336 KB Output is correct
19 Correct 4 ms 21336 KB Output is correct
20 Correct 3 ms 21080 KB Output is correct
21 Correct 3 ms 21336 KB Output is correct
22 Correct 3 ms 21336 KB Output is correct
23 Correct 4 ms 21080 KB Output is correct
24 Correct 4 ms 21336 KB Output is correct
25 Correct 4 ms 21080 KB Output is correct
26 Correct 4 ms 21336 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 1 ms 12632 KB Output is correct
3 Correct 1 ms 12636 KB Output is correct
4 Correct 2 ms 12632 KB Output is correct
5 Correct 1 ms 12632 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12636 KB Output is correct
8 Correct 1 ms 12632 KB Output is correct
9 Correct 2 ms 12632 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 3 ms 21080 KB Output is correct
12 Correct 4 ms 21336 KB Output is correct
13 Correct 3 ms 21592 KB Output is correct
14 Correct 5 ms 21340 KB Output is correct
15 Correct 3 ms 20824 KB Output is correct
16 Correct 4 ms 21596 KB Output is correct
17 Correct 4 ms 21084 KB Output is correct
18 Correct 4 ms 21336 KB Output is correct
19 Correct 4 ms 21336 KB Output is correct
20 Correct 3 ms 21080 KB Output is correct
21 Correct 3 ms 21336 KB Output is correct
22 Correct 3 ms 21336 KB Output is correct
23 Correct 4 ms 21080 KB Output is correct
24 Correct 4 ms 21336 KB Output is correct
25 Correct 4 ms 21080 KB Output is correct
26 Correct 4 ms 21336 KB Output is correct
27 Correct 30 ms 42584 KB Output is correct
28 Correct 67 ms 43108 KB Output is correct
29 Correct 13 ms 42584 KB Output is correct
30 Correct 29 ms 42788 KB Output is correct
31 Correct 24 ms 40024 KB Output is correct
32 Correct 39 ms 42576 KB Output is correct
33 Correct 11 ms 33368 KB Output is correct
34 Correct 28 ms 42328 KB Output is correct
35 Correct 37 ms 42316 KB Output is correct
36 Correct 43 ms 42328 KB Output is correct
37 Correct 27 ms 42072 KB Output is correct
38 Correct 68 ms 43024 KB Output is correct
39 Correct 29 ms 42072 KB Output is correct
40 Correct 15 ms 42072 KB Output is correct