Sagittarius's Trial A题

网站：https://vjudge.net/contest/279637#problem

Fox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so she decides to draw a snake instead.

A snake is a pattern on a n by m table. Denote c-th cell of r-th row as (r, c). The tail of the snake is located at (1, 1), then it’s body extends to (1, m), then goes down 2 rows to (3, m), then goes left to (3, 1) and so on.

Your task is to draw this snake for Fox Ciel: the empty cells should be represented as dot characters (’.’) and the snake cells should be filled with number signs (’#’).

Consider sample tests in order to understand the snake pattern.

Input
The only line contains two integers: n and m (3 ≤ n, m ≤ 50).

n is an odd number.

Output
Output n lines. Each line should contain a string consisting of m characters. Do not output spaces.

Examples
Input
3 3
Output

…#

Input
3 4
Output

…#

Input
5 3
Output

…#

#…

Input
9 9
Output
#########
…#
#########
#…
#########
…#
#########
#…
#########

#pragma warning(disable:4996)
#include<iostream>
using namespace std;

int main()
{
	int a=0,n,m, b=0, c, d;
	cin >> n >> m;
	for (a=1; a < n+1; a++)
		for (b = 0; b != m; b++)
		{
			if (a % 2 == 1)
			{
				cout << "#";
				if (b == m - 1)
					cout << endl;
			}
			else if ((a / 2) % 2 == 1)
			{
				if (b != m - 1)
				cout << ".";
				else
					cout << "#" << endl;
			}
			else if ((a / 2) % 2 == 0)
			{ 
				if (b == 0&&b!=m-1)
					cout << "#";
				else cout << ".";
				if (b == m - 1)
					cout << endl;
			}
		}
}