#include <stdio.h>

int grid[5*5] = {0};

typedef struct pt {

  int x;

  int y;

} pt;

void plot(pt p)

{

  grid[p.x+p.y*5] = 1;

}

pt pt1 = {2,1};

pt pt2 = {4,3};

pt pt3 = {0,3};

void line(pt a, pt b)

{

  pt change = {b.x - a.x, b.y - a.y};

  int ctx = change.x > 0 ? change.x : -change.x;

  int cty = change.y > 0 ? change.y : -change.y;

  int ct = ctx > cty ? ctx : cty;

  for (int t = 0; t <= ct; ++ t) {

    pt p = {a.x + change.x * t / ct, a.y + change.y * t / ct};

    plot(p);

  }

}

int main()

{

  line(pt1, pt2);

  line(pt2, pt3);

  line(pt3, pt1);

  for (int y = 0; y < 5; y ++) {

    for (int x = 0; x < 5; x ++)

      printf("%d", grid[x + y * 5]);

    printf("\n");

  }

}