#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;
const int N = 4e3 + 10;
const int INF = 1e9 + 7;
const int r[] = {-1, 0, 1, 0};
const int c[] = {0, -1, 0, 1};
char a[N][N];
int dist[N][N];
int main() {
cin.tie(0)->sync_with_stdio(0);
int h, w;
cin >> h >> w;
for(int i = 1; i <= h; i++) {
cin >> (a[i] + 1);
}
int ans = 0;
deque <pair <int, int>> dq;
dq.emplace_back(1, 1);
dist[1][1] = 1;
while(!dq.empty()) {
auto [xi, yi] = dq.front();
dq.pop_front();
ans = max(ans, dist[xi][yi]);
for(int d = 0; d < 4; d++) {
int xj = xi + r[d], yj = yi + c[d];
if(xj < 1 or xj > h or yj < 1 or yj > w or a[xj][yj] == '.') {
continue;
}
int w = (a[xi][yi] != a[xj][yj]);
if(dist[xj][yj] == 0) {
dist[xj][yj] = dist[xi][yi] + w;
if(w == 1) {
dq.emplace_back(xj, yj);
}
else {
dq.emplace_front(xj, yj);
}
}
}
}
cout << ans;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
5496 KB |
Output is correct |
| 2 |
Correct |
1 ms |
460 KB |
Output is correct |
| 3 |
Correct |
1 ms |
716 KB |
Output is correct |
| 4 |
Correct |
6 ms |
5188 KB |
Output is correct |
| 5 |
Correct |
3 ms |
2880 KB |
Output is correct |
| 6 |
Correct |
1 ms |
444 KB |
Output is correct |
| 7 |
Correct |
1 ms |
700 KB |
Output is correct |
| 8 |
Correct |
2 ms |
708 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1100 KB |
Output is correct |
| 10 |
Correct |
3 ms |
2520 KB |
Output is correct |
| 11 |
Correct |
3 ms |
2108 KB |
Output is correct |
| 12 |
Correct |
5 ms |
3016 KB |
Output is correct |
| 13 |
Correct |
4 ms |
2888 KB |
Output is correct |
| 14 |
Correct |
3 ms |
2860 KB |
Output is correct |
| 15 |
Correct |
12 ms |
5284 KB |
Output is correct |
| 16 |
Correct |
15 ms |
5400 KB |
Output is correct |
| 17 |
Correct |
8 ms |
5220 KB |
Output is correct |
| 18 |
Correct |
6 ms |
5124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
30852 KB |
Output is correct |
| 2 |
Correct |
44 ms |
15052 KB |
Output is correct |
| 3 |
Correct |
145 ms |
65268 KB |
Output is correct |
| 4 |
Correct |
70 ms |
32636 KB |
Output is correct |
| 5 |
Correct |
97 ms |
53264 KB |
Output is correct |
| 6 |
Correct |
473 ms |
99128 KB |
Output is correct |
| 7 |
Correct |
19 ms |
32164 KB |
Output is correct |
| 8 |
Correct |
16 ms |
30784 KB |
Output is correct |
| 9 |
Correct |
2 ms |
588 KB |
Output is correct |
| 10 |
Correct |
1 ms |
460 KB |
Output is correct |
| 11 |
Correct |
19 ms |
31548 KB |
Output is correct |
| 12 |
Correct |
1 ms |
1612 KB |
Output is correct |
| 13 |
Correct |
32 ms |
15152 KB |
Output is correct |
| 14 |
Correct |
20 ms |
10344 KB |
Output is correct |
| 15 |
Correct |
21 ms |
13012 KB |
Output is correct |
| 16 |
Correct |
37 ms |
5716 KB |
Output is correct |
| 17 |
Correct |
88 ms |
28768 KB |
Output is correct |
| 18 |
Correct |
61 ms |
35716 KB |
Output is correct |
| 19 |
Correct |
52 ms |
32692 KB |
Output is correct |
| 20 |
Correct |
39 ms |
25516 KB |
Output is correct |
| 21 |
Correct |
110 ms |
51208 KB |
Output is correct |
| 22 |
Correct |
100 ms |
52264 KB |
Output is correct |
| 23 |
Correct |
176 ms |
43520 KB |
Output is correct |
| 24 |
Correct |
94 ms |
48572 KB |
Output is correct |
| 25 |
Correct |
264 ms |
85260 KB |
Output is correct |
| 26 |
Correct |
305 ms |
126476 KB |
Output is correct |
| 27 |
Correct |
509 ms |
115004 KB |
Output is correct |
| 28 |
Correct |
477 ms |
99940 KB |
Output is correct |
| 29 |
Correct |
449 ms |
100040 KB |
Output is correct |
| 30 |
Correct |
523 ms |
104540 KB |
Output is correct |
| 31 |
Correct |
466 ms |
71608 KB |
Output is correct |
| 32 |
Correct |
376 ms |
102336 KB |
Output is correct |
