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A.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fast_io ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
const int N = 50 ;
char a[N + 5][N + 5] ;
int main()
{
fast_io;
int row,col ;
cin >> row >>col ;
for(int i = 1 ; i <= row ; i++)
{
for(int j = 1 ; j <= col ; j++)
{
a[i][j] = '.' ;
}
}
int cnt = 1 ;
for(int i = 1 ; i <= row ; i++)
{
if(i % 2 == 1)
{
for(int j = 1 ; j <=col ; j++)
{
a[i][j] = '#' ;
}
}
else
{
if(cnt % 2 == 1)
{
a[i][col] = '#' ;
}
else
a[i][1] = '#' ;
cnt++;
}
}
for(int i = 1 ; i <= row ; i++)
{
for(int j = 1 ; j <=col ; j++)
{
cout << a[i][j] ;
}
cout << '\n' ;
}
}