Monikulmio

import re
n,m,k=map(int,re.findall(r'\d+',input()))
p=[tuple(int(x)-1 for x in re.findall(r'\d+',input())) for _ in' '*k]
g=[list('.'*m) for _ in' '*n]
for (y1,x1),(y2,x2) in zip(p,p[1:]+p[:1]):
    dy=(y2>y1)-(y2<y1);dx=(x2>x1)-(x2<x1)
    c=dy==0 and '=' or dx==0 and '|' or (dy==dx and '\\' or '/')
    for t in range(1,max(abs(y2-y1),abs(x2-x1))): g[y1+dy*t][x1+dx*t]=c
for y,x in p: g[y][x]='*'
s=[]
for i in range(n):
    for j in (0,m-1):
        if 0<=j<m and g[i][j]=='.': g[i][j]='o';s.append((i,j))
for j in range(m):
    for i in (0,n-1):
        if 0<=i<n and g[i][j]=='.': g[i][j]='o';s.append((i,j))
while s:
    y,x=s.pop()
    for a,b in ((1,0),(-1,0),(0,1),(0,-1)):
        Y,X=y+a,x+b
        if 0<=Y<n and 0<=X<m and g[Y][X]=='.': g[Y][X]='o';s.append((Y,X))
print('\n'.join(''.join('#'if c=='.'else'.'if c=='o'else c for c in r) for r in g))

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