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 ;
int h , w ;
char arr[4010][4010];
int dis[4010][4010];
int ans = 0 ;
pair<int , int > cor [] = {{1 , 0} , {-1 , 0} , {0 , 1} , {0 , -1}} ;
void bfs(){
deque<pair<int , int > > d ;
dis[0][0] = 1 ;
d.push_back({0 , 0});
while(d.size()){
auto fr = d.front();
d.pop_front();
ans = max(ans , dis[fr.first][fr.second]);
for(int ii = 0 ; ii < 4 ; ii ++){
int nx = cor[ii].first + fr.first ;
int ny = cor[ii].second + fr.second ;
int x = fr.first , y = fr.second ;
if(nx < 0 || ny < 0 || nx >= h || ny >= w || arr[nx][ny] == '.')continue ;
int w = arr[x][y] != arr[nx][ny];
if(dis[nx][ny] > dis[x][y] + w){
dis[nx][ny] = dis[x][y] + w ;
if(w)d.push_back({nx , ny});
else d.push_front({nx , ny});
}
}
}
}
int main(){
cin >> h >> w ;
for(int i = 0 ; i < h ; i ++)
for(int j = 0 ;j < w ; j ++){
cin >> arr[i][j];
dis[i][j] = 1e9 ;
}
bfs();
cout << ans ;
}
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