Submission #888333

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
888333	2023-12-17T01:44:44 Z	alan_c	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	349 ms	101728 KB

tracks

#include <bits/stdc++.h>
using namespace std;

const int N = 4000, x[4] = {0, 0, -1, 1}, y[4] = {-1, 1, 0, 0};
string t[N];
bitset<N> v[N];

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int h, w; cin >> h >> w;
  for (int i = 0; i < h; i++) cin >> t[i];

  int ans = 1;
  struct node {
    int r, c, d;
  };
  deque<node> bfs;
  bfs.push_back({0, 0, 1});
  while (!bfs.empty()) {
    node n = bfs.front();
    bfs.pop_front();
    ans = max(ans, n.d);

    for (int i = 0; i < 4; i++) {
      int r = n.r + x[i], c = n.c + y[i];
      if (r >= 0 && r < h && c >= 0 && c < w && !v[r][c] && t[r][c] != '.') {
        if (t[r][c] == t[n.r][n.c])
          bfs.push_front({r, c, n.d});
        else
          bfs.push_back({r, c, n.d + 1});
        v[r][c] = 1;
      }
    }
  }
  cout << ans << '\n';
}

Subtask #1

30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	7 ms	1368 KB	Output is correct
2	Correct	0 ms	600 KB	Output is correct
3	Correct	0 ms	604 KB	Output is correct
4	Correct	4 ms	1372 KB	Output is correct
5	Correct	1 ms	860 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	604 KB	Output is correct
8	Correct	0 ms	604 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct
10	Correct	2 ms	604 KB	Output is correct
11	Correct	1 ms	860 KB	Output is correct
12	Correct	3 ms	860 KB	Output is correct
13	Correct	1 ms	860 KB	Output is correct
14	Correct	2 ms	860 KB	Output is correct
15	Correct	6 ms	1372 KB	Output is correct
16	Correct	7 ms	1372 KB	Output is correct
17	Correct	5 ms	1116 KB	Output is correct
18	Correct	4 ms	1372 KB	Output is correct

Subtask #2

70.0 / 70.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	2396 KB	Output is correct
2	Correct	23 ms	4188 KB	Output is correct
3	Correct	122 ms	35712 KB	Output is correct
4	Correct	29 ms	8948 KB	Output is correct
5	Correct	98 ms	20764 KB	Output is correct
6	Correct	341 ms	54804 KB	Output is correct
7	Correct	2 ms	2396 KB	Output is correct
8	Correct	2 ms	2396 KB	Output is correct
9	Correct	1 ms	600 KB	Output is correct
10	Correct	1 ms	604 KB	Output is correct
11	Correct	2 ms	2392 KB	Output is correct
12	Correct	1 ms	604 KB	Output is correct
13	Correct	24 ms	4188 KB	Output is correct
14	Correct	14 ms	2652 KB	Output is correct
15	Correct	8 ms	2908 KB	Output is correct
16	Correct	12 ms	1884 KB	Output is correct
17	Correct	59 ms	10064 KB	Output is correct
18	Correct	34 ms	9944 KB	Output is correct
19	Correct	29 ms	9364 KB	Output is correct
20	Correct	31 ms	8272 KB	Output is correct
21	Correct	78 ms	21076 KB	Output is correct
22	Correct	98 ms	20564 KB	Output is correct
23	Correct	118 ms	17744 KB	Output is correct
24	Correct	78 ms	20564 KB	Output is correct
25	Correct	192 ms	35832 KB	Output is correct
26	Correct	266 ms	101728 KB	Output is correct
27	Correct	278 ms	65164 KB	Output is correct
28	Correct	340 ms	54720 KB	Output is correct
29	Correct	349 ms	53352 KB	Output is correct
30	Correct	311 ms	54608 KB	Output is correct
31	Correct	302 ms	23860 KB	Output is correct
32	Correct	247 ms	54796 KB	Output is correct