star11.cpp

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

char** arr;

void mk_tri(int dis, int x, int y);

int main(int argc, char* argv[])
{
	int n, size;
	scanf("%d", &n);
	size = n * 2 - 1;
	arr = (char**)malloc(sizeof(char*) * n);
	for (int i = 0; i < n; i++)
	{
		arr[i] = (char*)malloc(sizeof(char) * size + 2);
		for (int j = 0; j < size; j++)
			arr[i][j] = ' ';
		arr[i][size] = '\n';
		arr[i][size + 1] = '\0';
	}
	mk_tri(n, 0, n - 1);

	for (int i = 0; i < n; i++) {
		printf(arr[i]);
	}

	return 0;
}

void mk_tri(int dis, int x, int y)
{
	int half_dis = dis / 2;
	if (dis == 3)
	{
		arr[y - 2][x + 2] = '*';
		arr[y - 1][x + 1] = '*';
		arr[y - 1][x + 3] = '*';
		for (int i = 0; i < 5; i++)
			arr[y][x + i] = '*';
	}
	else {
		mk_tri(half_dis, x, y);
		mk_tri(half_dis, x + dis, y);
		mk_tri(half_dis, x + half_dis, y - half_dis);
	}
}