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>
using namespace std;
typedef long long ll;
//#include<bits/extc++.h>
//__gnu_pbds
char arr[1005][1005];
int tcnt = 0;
int bcnt = 0;
int n,m;
int dx[4]={0,0,-1,1};
int dy[4] = {1,-1,0,0};
bool inbound(int x,int y){
return (x>=0 && x<n && y>=0 && y<m);
}
void dfs(int x,int y,char t,char re){
if(t=='B'){
bcnt--;
tcnt++;
}else{
tcnt--;
bcnt++;
}
arr[x][y]=re;
for(int i=0;i<4;i++){
if(!inbound(x+dx[i],y+dy[i])) continue;
if(arr[x+dx[i]][y+dy[i]]==t){
dfs(x+dx[i],y+dy[i],t,re);
}
}
}
int main(){
ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
cin>>n>>m;
for(int i=0;i<n;i++){
string s;cin>>s;
for(int j=0;j<m;j++){
arr[i][j] = s[j];
if(s[j]=='B') bcnt++;
if(s[j]=='T') tcnt++;
}
}
if(arr[n-1][m-1]=='*'){
cout<<0<<"\n";
return 0;
}
int cnt = 1;
while(bcnt && tcnt){
if(arr[n-1][m-1]=='B'){
dfs(n-1,m-1,'B','T');
}else{
dfs(n-1,m-1,'T','B');
}
cnt++;
/*for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
cout<<arr[i][j];
}
cout<<"\n";
}*/
}
cout<<cnt<<"\n";
return 0;
}
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