#include <bits/stdc++.h>
using namespace std;
const int N = 4000;
const int M = 4000;
int n, m;
char a[N][M];
int d[N][M];
int ans = 1;
int dx[4] = {1, -1, 0, 0};
int dy[4] = {0, 0, 1, -1};
bool inside(int r, int c) {
if (r < 0 || r > n || c < 0 || c > m) return false;
if (a[r][c] == '.') return false;
return true;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m;
for(int i = 0 ; i < n; i++){
string s; cin >> s;
for(int j = 0 ; j < m; j++){
a[i][j] = s[j];
}
}
n--; m--;
deque<pair<int, int>> q;
q.push_back({0, 0});
d[0][0] = 1;
while(!q.empty()){
auto node = q.front();
q.pop_front();
ans = max(ans, d[node.first][node.second]);
for(int i = 0 ; i < 4; i++){
int x = node.first + dx[i]; int y = node.second + dy[i];
if(inside(x, y) && d[x][y] == 0){
if(a[node.first][node.second] == a[x][y]){
d[x][y] = d[node.first][node.second];
q.push_front({x, y});
}
else {
d[x][y] = d[node.first][node.second] + 1;
q.push_back({x, y});
}
}
}
}
cout << ans << "\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
0 ms |
460 KB |
Output is correct |
| 3 |
Correct |
1 ms |
716 KB |
Output is correct |
| 4 |
Correct |
8 ms |
4940 KB |
Output is correct |
| 5 |
Correct |
3 ms |
2764 KB |
Output is correct |
| 6 |
Correct |
1 ms |
460 KB |
Output is correct |
| 7 |
Correct |
1 ms |
716 KB |
Output is correct |
| 8 |
Correct |
1 ms |
716 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1100 KB |
Output is correct |
| 10 |
Correct |
3 ms |
2344 KB |
Output is correct |
| 11 |
Correct |
3 ms |
2124 KB |
Output is correct |
| 12 |
Correct |
5 ms |
3020 KB |
Output is correct |
| 13 |
Correct |
3 ms |
2764 KB |
Output is correct |
| 14 |
Correct |
3 ms |
2764 KB |
Output is correct |
| 15 |
Correct |
10 ms |
4976 KB |
Output is correct |
| 16 |
Correct |
14 ms |
5284 KB |
Output is correct |
| 17 |
Correct |
9 ms |
4940 KB |
Output is correct |
| 18 |
Correct |
8 ms |
5004 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
20 ms |
30972 KB |
Output is correct |
| 2 |
Correct |
45 ms |
13508 KB |
Output is correct |
| 3 |
Correct |
185 ms |
57836 KB |
Output is correct |
| 4 |
Correct |
72 ms |
28972 KB |
Output is correct |
| 5 |
Correct |
157 ms |
44484 KB |
Output is correct |
| 6 |
Correct |
578 ms |
92132 KB |
Output is correct |
| 7 |
Correct |
20 ms |
32520 KB |
Output is correct |
| 8 |
Correct |
19 ms |
30844 KB |
Output is correct |
| 9 |
Correct |
2 ms |
588 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
19 ms |
31536 KB |
Output is correct |
| 12 |
Correct |
2 ms |
1612 KB |
Output is correct |
| 13 |
Correct |
41 ms |
13548 KB |
Output is correct |
| 14 |
Correct |
23 ms |
9592 KB |
Output is correct |
| 15 |
Correct |
24 ms |
12108 KB |
Output is correct |
| 16 |
Correct |
18 ms |
5068 KB |
Output is correct |
| 17 |
Correct |
104 ms |
24772 KB |
Output is correct |
| 18 |
Correct |
91 ms |
31956 KB |
Output is correct |
| 19 |
Correct |
73 ms |
29064 KB |
Output is correct |
| 20 |
Correct |
49 ms |
22064 KB |
Output is correct |
| 21 |
Correct |
120 ms |
43756 KB |
Output is correct |
| 22 |
Correct |
158 ms |
44388 KB |
Output is correct |
| 23 |
Correct |
197 ms |
36148 KB |
Output is correct |
| 24 |
Correct |
119 ms |
40776 KB |
Output is correct |
| 25 |
Correct |
449 ms |
78576 KB |
Output is correct |
| 26 |
Correct |
340 ms |
118996 KB |
Output is correct |
| 27 |
Correct |
465 ms |
105416 KB |
Output is correct |
| 28 |
Correct |
577 ms |
92424 KB |
Output is correct |
| 29 |
Correct |
564 ms |
90568 KB |
Output is correct |
| 30 |
Correct |
524 ms |
94892 KB |
Output is correct |
| 31 |
Correct |
472 ms |
63316 KB |
Output is correct |
| 32 |
Correct |
400 ms |
90416 KB |
Output is correct |
