#B4124. Draw a Right Arrow

    ID: 11781 Type: Default 1000ms 256MiB

Draw a Right Arrow

Draw a Right Arrow

A right arrow is composed by splicing a horizontal bar (a rectangle) and a rightward isosceles triangle. The overall figure is vertically symmetric. In the upper half of the triangle, the first row occupies $1$ cell, the second row occupies $2$ cells, and so on. Specifically, the arrow is drawn in an $n\times m$ grid such that:

  • The horizontal bar has a height of $k$ and appears in the middle of the arrow.
  • The remaining top and bottom parts (each of height $t=\frac{n-k}{2}$) display the triangle. In these parts, the triangle portion occupies a fixed block of width $B$ on the right. In the top triangle part the $i$th row (starting from $0$) has $(i+1)$ '#' characters (left‐aligned in the block) and the rest of the block is filled with dots. The bottom triangle part is the vertical mirror of the top.
  • The horizontal bar rows (from row $t$ to row $t+k-1$) are drawn by splicing a left rectangle and the triangle block. In these rows, the left part (of fixed width $L$) is filled with '#' characters, while the triangle block is drawn in a way that its number of '#' characters is $B$ on the middle horizontal bar row and $B-1$ on the other horizontal bar rows. Here, the values $L$ and $B$ are determined by the formulas:
    $L = m - (k+1)$ and $B = m - L = k+1$.

For example, when n = 7, m = 10, and k = 3, we have $t=2$, $L=10-(3+1)=6$, and $B=4$, and the arrow will look like:

......#...
......##..
#########.
##########
#########.
......##..
......#...

Given three integers n, m, and k, draw the right arrow according to the above rules.

inputFormat

The input consists of three space‐separated integers:

  1. n: the number of rows of the grid (an odd integer).
  2. m: the number of columns of the grid.
  3. k: the height of the horizontal bar (an odd integer less than n).

outputFormat

Output the drawn arrow pattern consisting of n lines and m columns. Use the character '#' to represent a filled cell and '.' to represent an empty cell.

sample

7 10 3
......#...

......##.. #########. ########## #########. ......##.. ......#...

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