#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
//* sol https://boi2013.informatik-olympiade.de/wp-content/uploads/2013/05/tracks-spoiler.pdf
char grid[4005][4005], cur;
bool vis[4005][4005];
int h, w, n, cnt, ans = 0;
bool valid(int i, int j){
return (i>=1 && i<=h && j>=1 && j<=w);
}
void dfs(int i, int j){
cnt++;
vis[i][j] = 1;
if(!vis[i+1][j] && valid(i+1,j) && grid[i+1][j]==cur){
grid[i+1][j] = (cur=='F' ? 'R' : 'F');
dfs(i+1,j);
}
if(!vis[i][j+1] && valid(i,j+1) && grid[i][j+1]==cur){
grid[i][j+1] = (cur=='F' ? 'R' : 'F');
dfs(i,j+1);
}
if(!vis[i-1][j] && valid(i-1,j) && grid[i-1][j]==cur){
grid[i-1][j] = (cur=='F' ? 'R' : 'F');
dfs(i-1,j);
}
if(!vis[i][j-1] && valid(i,j-1) && grid[i][j-1]==cur){
grid[i][j-1] = (cur=='F' ? 'R' : 'F');
dfs(i,j-1);
}
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin>>h>>w;
for(int i=1;i<=h;i++){
for(int j=1;j<=w;j++){
cin>>grid[i][j];
if(grid[i][j] != '.') n++;
}
}
if(grid[1][1] == '.') {
cout<<"0\n";
return 0;
}
while(cnt<n){
cnt = 0;
cur = grid[1][1];
for(int i=1;i<=h;i++){
for(int j=1;j<=w;j++) vis[i][j] = 0;
}
grid[1][1] = (cur=='F' ? 'R' : 'F');
dfs(1,1);
++ans;
// for(int i=1;i<=h;i++){
// for(int j=1;j<=w;j++) cout<<grid[i][j]<<' ';
// cout<<'\n';
// }
}
cout<<ans<<'\n';
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
189 ms |
26784 KB |
Output is correct |
| 2 |
Correct |
1 ms |
468 KB |
Output is correct |
| 3 |
Correct |
1 ms |
724 KB |
Output is correct |
| 4 |
Correct |
22 ms |
20948 KB |
Output is correct |
| 5 |
Correct |
30 ms |
3572 KB |
Output is correct |
| 6 |
Correct |
1 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
724 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1108 KB |
Output is correct |
| 10 |
Correct |
26 ms |
2496 KB |
Output is correct |
| 11 |
Correct |
5 ms |
6188 KB |
Output is correct |
| 12 |
Correct |
35 ms |
9932 KB |
Output is correct |
| 13 |
Correct |
30 ms |
3612 KB |
Output is correct |
| 14 |
Correct |
31 ms |
3548 KB |
Output is correct |
| 15 |
Correct |
210 ms |
8428 KB |
Output is correct |
| 16 |
Correct |
179 ms |
26796 KB |
Output is correct |
| 17 |
Correct |
215 ms |
10088 KB |
Output is correct |
| 18 |
Correct |
28 ms |
20948 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1313 ms |
31420 KB |
Output is correct |
| 2 |
Execution timed out |
2083 ms |
14456 KB |
Time limit exceeded |
| 3 |
Execution timed out |
2081 ms |
32536 KB |
Time limit exceeded |
| 4 |
Execution timed out |
2085 ms |
36220 KB |
Time limit exceeded |
| 5 |
Execution timed out |
2074 ms |
24672 KB |
Time limit exceeded |
| 6 |
Runtime error |
1456 ms |
1048576 KB |
Execution killed with signal 9 |
| 7 |
Correct |
1343 ms |
32476 KB |
Output is correct |
| 8 |
Correct |
1411 ms |
31580 KB |
Output is correct |
| 9 |
Correct |
70 ms |
2064 KB |
Output is correct |
| 10 |
Correct |
138 ms |
852 KB |
Output is correct |
| 11 |
Correct |
566 ms |
31668 KB |
Output is correct |
| 12 |
Correct |
969 ms |
2792 KB |
Output is correct |
| 13 |
Execution timed out |
2071 ms |
14724 KB |
Time limit exceeded |
| 14 |
Execution timed out |
2077 ms |
10360 KB |
Time limit exceeded |
| 15 |
Execution timed out |
2084 ms |
10368 KB |
Time limit exceeded |
| 16 |
Execution timed out |
2080 ms |
7464 KB |
Time limit exceeded |
| 17 |
Execution timed out |
2057 ms |
18788 KB |
Time limit exceeded |
| 18 |
Execution timed out |
2066 ms |
17488 KB |
Time limit exceeded |
| 19 |
Execution timed out |
2073 ms |
36304 KB |
Time limit exceeded |
| 20 |
Execution timed out |
2077 ms |
15296 KB |
Time limit exceeded |
| 21 |
Execution timed out |
2079 ms |
25416 KB |
Time limit exceeded |
| 22 |
Execution timed out |
2061 ms |
24744 KB |
Time limit exceeded |
| 23 |
Execution timed out |
2053 ms |
22152 KB |
Time limit exceeded |
| 24 |
Execution timed out |
2077 ms |
25636 KB |
Time limit exceeded |
| 25 |
Execution timed out |
2071 ms |
32724 KB |
Time limit exceeded |
| 26 |
Runtime error |
658 ms |
1048576 KB |
Execution killed with signal 9 |
| 27 |
Runtime error |
1124 ms |
1048576 KB |
Execution killed with signal 9 |
| 28 |
Runtime error |
1099 ms |
1048576 KB |
Execution killed with signal 9 |
| 29 |
Runtime error |
982 ms |
1048576 KB |
Execution killed with signal 9 |
| 30 |
Runtime error |
1119 ms |
1048576 KB |
Execution killed with signal 9 |
| 31 |
Execution timed out |
2113 ms |
338352 KB |
Time limit exceeded |
| 32 |
Runtime error |
1079 ms |
1048576 KB |
Execution killed with signal 9 |
