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;
}
}
}