Monikulmio

def sign(x):
    return (x > 0) - (x < 0)

n, m, k = map(int, input().split())
points = [tuple(map(int, input().split())) for _ in range(k)]

points = [(y - 1, x - 1) for y, x in points]

grid = [['.' for _ in range(m)] for _ in range(n)]

# Piiretään reunat 
for i in range(k):
    y1, x1 = points[i]
    y2, x2 = points[(i + 1) % k]
    dy, dx = sign(y2 - y1), sign(x2 - x1)
    y, x = y1, x1
    grid[y][x] = '*'
    while (y, x) != (y2, x2):
        y += dy
        x += dx
        if (y, x) == (y2, x2):
            grid[y][x] = '*'
        else:
            if dy == 0:
                grid[y][x] = '='
            elif dx == 0:
                grid[y][x] = '|'
            elif dy == dx:
                grid[y][x] = '\\'
            else:
                grid[y][x] = '/'


# Täytetään sisäosa
for y in range(n):
    
    crossings = sum(grid[y][x] in ('|', '/', '\\', '*') for x in range(m))

    #Jos vain yksi tähti    
    if crossings < 2:
        continue

    inside = False
    for x in range(m):
        if grid[y][x] in ('|', '/', '\\', '*'):
            inside = not inside
        elif inside and grid[y][x] == '.':
            grid[y][x] = '#'



for row in grid:
    print(''.join(row))

Test 1 (public)

Verdict: ACCEPTED

Test 2 (public)

Verdict: ACCEPTED

Test 3 (public)

Verdict: ACCEPTED

Test 4 (public)

Verdict: ACCEPTED

Test 5 (public)

Verdict: ACCEPTED

Test 6 (public)

Verdict: ACCEPTED

Test 7 (public)

Verdict: ACCEPTED

Test 8 (public)

Verdict: ACCEPTED

Test 9 (public)

Verdict: ACCEPTED

Test 10 (public)

Verdict: ACCEPTED