二分插入排序

#include
#include
#define MAX 20
using namespace std;



void print(int arr[], int max)
{
	for (int i = 1; i < MAX + 1; i++) { std::cout << arr[i] << " "; }
	std::cout << std::endl;
}

//二分插入排序

void test()
{
	srand((unsigned int)time(NULL));
	
	int arr[21] = { 0 };
	

	for (int i = 1; i < MAX + 1; i++)
	{
		int ret = rand() % 100 + 1;

		//二分查找
		int head = 1;
		int tail = i - 1;
		int mid = head + (tail - head) / 2;

		while (head <= tail)		//循环条件
		{
			if (ret < arr[mid]) { tail = mid - 1; }
			else { head = mid + 1; }
			mid = head + (tail - head) / 2;
		}
		for (int j = i; j >= head; j--) { arr[j] = arr[j - 1]; }
		arr[head] = ret;
	}

	print(arr, MAX);
}

int main() 
{
	test();
	system("pause");
	return 0;
}