#include <stdio.h>
#include <stdlib.h>
#include <time.h>
static char*f="Usage: sig1m [<xsize> [<ysize>]]\n\n";
static int x=39,y=12,k,K,r,dx,dy;
static char *F(int X,int Y) { return X+f+Y*x; }
#define else(a,b,c)if(!(*F(X+a,Y+b)&4)){xta[tan]=a,yta[tan]=b;sta[tan++]=c;}
static int G(int X,int Y)
{
	if(!f)
	{
		f=(char *)calloc(X,Y);
		for(Y=0;Y<y;Y++)
		    for(X=0;X<x;X++)
		        *F(X,Y)=(!X||!Y)?4:X==(x-1)?5:Y==(y-1)?6:3;
		for(Y=G(X/2,Y/2);Y<y;++Y)
		{
			for(X=1; X<x; putchar(" -"[r]),++X)
				putchar(" ---|,.+|`'+|+++"[(*F(X-1,Y)&2)+(r=(*F(X,Y)&2)/2)+(*F(X,Y-1)&1)*8+(*F(X,Y)&1)*4]);
			printf("\n");
			if(Y<y-1)for(X=1; X<x; ++X)printf("%c ", (*F(X,Y)&1)?'|':' ');
			printf("\n");
		}
		return 0;
	}
	
	for(*F(X,Y) |= 4; ; G(X+dx, Y+dy))
	{
		int xta[4],yta[4],sta[4],tan=0;
		else(-1,0,1)
		else(0,-1,2)
		else(1,0,3)
		else(0,1,4)
		if(!tan)break;
		tan = rand()%tan;
		dx = xta[tan];
		dy = yta[tan];
		switch(sta[tan])
		{
			case 1:
				*F(X, Y) &= ~1;
				break;
			case 2:
				*F(X, Y) &= ~2;
				break;
			case 3:
				*F(X+1, Y) &= ~1;
				break;
			case 4:
				*F(X, Y+1) &= ~2;
				break;
		}
	}
	return 1;
} 

int main(int A, const char**V)
{
    for(srand(time(0)); K^34; putchar(f[K++]));
    for(f=(char*)0;--A;)*(k++?&y:&x)=atoi(*++V);
    return G(x, y);
}