Monikulmio

input/code.c: In function 'main':
input/code.c:88:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |     scanf("%i %i %i", &h, &w, &c);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.c:95:9: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |         scanf("%i %i", &(*n)->y, &(*n)->x);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct p
{
    int x, y;
    struct p* n;
};

static int w, h, c;

void dl (char* fb, struct p* p1, struct p* p2)
{
    int dx, dy, tx, ty, i;
    char tc;

    dx = p2->x - p1->x;
    dy = p2->y - p1->y;
 
    tx = p1->x;
    ty = p1->y;

    tc = (dx < 0 && dy < 0) || (dx > 0 && dy > 0) ? '\\' :
	    (dx * dy < 0) ? '/' :
	    dx == 0 ? '|' : '=';
    
    while (dx || dy)
    {
	if (dx)
	{
	    tx += dx < 0 ? -1 : 1;
	    dx += dx < 0 ? 1 : -1;
	}

	if (dy)
	{
	    ty += dy < 0 ? -1 : 1;
	    dy += dy < 0 ? 1 : -1;
	}

	i = ty * w + tx;
	if (fb[i] == '.')
	    fb[i] = tc;
    }
}

void as (char* fb, struct p* ad)
{
    struct p *c, *l;

    l = ad;
    
    while (ad)
    {
	fb[ad->y * w + ad->x] = '*';

	if ((c = ad->n))
	{
	    fb[c->y * w + c->x] = '*';
	    dl(fb, ad, c);
	}
	else
	{
	    dl(fb, ad, l);
	}
	    
	ad = ad->n;
    }

}

void print_g (char* fb)
{ 
    for (int i = 0; i < h; i++)
    {
	for (int j = 0; j < w; j++)
	    putc(*(fb + i * w + j), stdout);
	putc('\n', stdout);
    }
}

int main (void)
{
    char* fb;
    struct p *ppoints, **n = &ppoints;

    scanf("%i %i %i", &h, &w, &c);
    fb = malloc(w * h);
    memset(fb, '.', w * h);
    
    while (c--)
    {
	(*n) = malloc(sizeof(struct p)); 
	scanf("%i %i", &(*n)->y, &(*n)->x);
	(*n)->x--;
	(*n)->y--;
	n = &(*n)->n;
    }

    as(fb, ppoints);
    print_g(fb);

    free(fb);
    return 0;
}

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