void rect (int xp, int yp, int xs, int ys) {
  for (y=yp; y<=yp+ys; y++) {
    //xp is position on x
    grid[y][xp]=1; //xs is how long is on x
    grid[y][xp+xs]=1; //every loop set 2 lines in array grid[][]
  }
  for (x=xp; x<=xp+xs; x++) {
    grid[yp][x]=1;
    grid[yp+ys][x]=1;
  }
}