This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define ll long long
#define pii pair<int, int>
using namespace std;
const int MAX = 1005;
pii dirs[4] = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
int n, m;
int grid[MAX][MAX];
bool visited[MAX][MAX];
int dfs(pii cord){
visited[cord.first][cord.second] = 1;
int ans = 1;
for(pii d:dirs){
pii cord1 = {cord.first + d.first, cord.second + d.second};
if(cord1.first >= 0 && cord1.first < n && cord1.second >= 0 && cord1.second < m &&
!visited[cord1.first][cord1.second] && grid[cord1.first][cord1.second] == grid[cord.first][cord.second]){
ans += dfs(cord1);
}
}
grid[cord.first][cord.second] = 3 - grid[cord.first][cord.second];
return ans;
}
int main(){
cin >> n >> m;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
{
char c; cin >> c;
if(c == 'B'){
grid[i][j] = 1;
}
else if(c == 'T'){
grid[i][j] = 2;
}
}
}
int ans = 0;
int last = 0;
while(true){
int a = dfs({0, 0});
if(last == a){
break;
}
else{
++ans;
}
last = a;
memset(visited, 0, sizeof(visited));
}
cout << ans << '\n';
}
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