#include <bits/stdc++.h>
using namespace std;
bitset<4005> vis[4005], occ[4005], fox[4005];
vector<pair<short, short>> cur;
int h, w, dep = 1;
const int dr[4] = {0, 1, 0, -1}, dc[4] = {1, 0, -1, 0};
void dfs (short r, short c, bool f) {
if (!vis[r][c]) cur.push_back({r, c});
vis[r][c] = true;
for (int k = 0; k < 4; k++) {
short rv = r + dr[k], cv = c + dc[k];
if (rv >= 1 && rv <= h && cv >= 1 && cv <= w && !vis[rv][cv] && occ[rv][cv] && fox[rv][cv] == f) dfs(rv, cv, f);
}
}
int main () {
cin >> h >> w;
for (int i = 1; i <= h; i++) for (int j = 1; j <= w; j++) {
char ch;
cin >> ch;
if (ch != '.') occ[i][j] = true;
if (ch == 'F') fox[i][j] = true;
}
dfs(1, 1, fox[1][1]);
while (true) {
vector<pair<short, short>> last;
last.swap(cur);
for (auto& [r, c] : last) dfs(r, c, (dep & 1) ^ fox[1][1]);
last.clear();
if (cur.empty()) {
cout << dep << '\n';
return 0;
}
dep++;
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
19 ms |
3160 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2392 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
11 ms |
4980 KB |
Output is correct |
| 5 |
Correct |
5 ms |
2652 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2800 KB |
Output is correct |
| 11 |
Correct |
4 ms |
3676 KB |
Output is correct |
| 12 |
Correct |
9 ms |
2852 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2652 KB |
Output is correct |
| 14 |
Correct |
4 ms |
2652 KB |
Output is correct |
| 15 |
Correct |
17 ms |
3120 KB |
Output is correct |
| 16 |
Correct |
20 ms |
3224 KB |
Output is correct |
| 17 |
Correct |
16 ms |
2908 KB |
Output is correct |
| 18 |
Correct |
11 ms |
4956 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
6492 KB |
Output is correct |
| 2 |
Correct |
79 ms |
5084 KB |
Output is correct |
| 3 |
Correct |
606 ms |
6992 KB |
Output is correct |
| 4 |
Correct |
132 ms |
5464 KB |
Output is correct |
| 5 |
Correct |
425 ms |
6224 KB |
Output is correct |
| 6 |
Correct |
1004 ms |
173084 KB |
Output is correct |
| 7 |
Correct |
4 ms |
6748 KB |
Output is correct |
| 8 |
Correct |
4 ms |
6492 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2908 KB |
Output is correct |
| 10 |
Correct |
2 ms |
2908 KB |
Output is correct |
| 11 |
Correct |
3 ms |
6492 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2652 KB |
Output is correct |
| 13 |
Correct |
72 ms |
5272 KB |
Output is correct |
| 14 |
Correct |
45 ms |
4836 KB |
Output is correct |
| 15 |
Correct |
39 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
36 ms |
2908 KB |
Output is correct |
| 17 |
Correct |
174 ms |
5724 KB |
Output is correct |
| 18 |
Correct |
149 ms |
5712 KB |
Output is correct |
| 19 |
Correct |
126 ms |
5460 KB |
Output is correct |
| 20 |
Correct |
124 ms |
5468 KB |
Output is correct |
| 21 |
Correct |
328 ms |
6480 KB |
Output is correct |
| 22 |
Correct |
381 ms |
6484 KB |
Output is correct |
| 23 |
Correct |
358 ms |
6228 KB |
Output is correct |
| 24 |
Correct |
397 ms |
6740 KB |
Output is correct |
| 25 |
Correct |
652 ms |
7248 KB |
Output is correct |
| 26 |
Runtime error |
883 ms |
1048576 KB |
Execution killed with signal 9 |
| 27 |
Correct |
1415 ms |
806832 KB |
Output is correct |
| 28 |
Correct |
1126 ms |
172716 KB |
Output is correct |
| 29 |
Correct |
1046 ms |
142248 KB |
Output is correct |
| 30 |
Correct |
1123 ms |
327704 KB |
Output is correct |
| 31 |
Correct |
731 ms |
7888 KB |
Output is correct |
| 32 |
Correct |
1174 ms |
577948 KB |
Output is correct |
