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;
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0)
int main()
{
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
    ll n,m;
    cin>>n>>m;
    vector<vector<char>> v(n,vector<char>(m));
    for(int i=0; i<n; ++i){
        for(int j=0;j<m; ++j){
            cin>>v[i][j];
        }
    }
    ll sum=1e18;
    ll last =-1;
    ll ans=0;
    for(int i=0; i<n; ++i){
        for(int j=0; j<m; ++j){
            if(v[i][j]=='#' && last==-1){
                ++ans;
                last=1;
            }
            else{
              last=-1;
            }
        }
        sum = min(sum,ans);
    }
    for(int j=0; j<m; ++j){
        for(int i=0; i<n; ++i){
            if(v[i][j]=='#' && last==-1){
                ++ans;
                last=1;
            }
            else{
              last=-1;
            }
        }
        sum = min(sum,ans);
    }
    return 0;
}
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