获取一个整型数组前三个最大的值

没有用堆排序，遍历一次就够了，顺便练习一下二维数组

#include <stdio.h>
int (*getmin(int (*input)[3],int (*out)[1]))[1]
{
	
	if (input == NULL)
	{
		return NULL;
	}
	
	if (input[0][0] < input[0][1])
	{
		if (input[0][0] < input[0][2])
		{
			out[0][0] = 0;
			out[1][0] = 0;
			return out;
		}
		else
		{
			out[0][0] = 0;
			out[1][0] = 2;
			return out;
		}
	}

	if (input[0][1] < input[0][2])
	{
		out[0][0] = 0;
		out[1][0] = 1;
		return out;
	}
	else
	{
		out[0][0] = 0;
		out[1][0] = 2;
		return out;
	}
}

void get3maxnum(int *num,size_t size,int (*out)[3])
{
	size_t i;
	int res[2][1] = {0};
	int (*pres)[1] = NULL;
	if (size < 3 || num == NULL || out == NULL)
	{
		return ;
	}

	//初始化
	out[0][0] = *(num + 0);
	out[1][0] = 0;
	
	out[0][1] = *(num + 1);
	out[1][1] = 1;
	
	out[0][2] = *(num + 2);
	out[1][2] = 2;

	for (i = 3; i < size; ++i)
	{
		pres = getmin(out,res);//返回一个二维指针
		if (*(num + i) > out[pres[0][0]][pres[1][0]])
		{
			out[pres[0][0]][pres[1][0]] = *(num + i);
			out[1][pres[1][0]] = i;
		}
	}
}

int main(void)
{
	int a[] = {454,45,54,48,0,1,888,9};
	int res[2][3] = {0};
	int i = 0;
	get3maxnum(a,sizeof(a)/sizeof(a[0]),res);
	printf("前三个最大值：	");
	for (i = 0; i < 3; ++i)
	{
		printf("%4d ",res[0][i]);
	}
	printf("
索引：		");
	for (i = 0; i < 3; ++i)
	{
		printf("%4d ",res[1][i]);
	}
	putchar("
");
	return 0;
}