返回二维数组最大子数组的和

程序代码：
#include<stdio.h>
#define M 5
#define N 4
int maxSubArray(int arr[], int len)
{
	int i, sum = arr[0], b = 0;
	for (i = 0; i<len; ++i)
	{
		if (b>0)
			b += arr[i];
		else
			b = arr[i];
		if (b>sum)
			sum = b;
	}
	return sum;
}
int maxSubMatrix(int n, int m, int array[M][N])
{
	int i, j, h, max, sum = -100000;
	int b[100];
	for (i = 0; i < n; i++)
	{
		memset(b, 0, sizeof(b));
		for (j = i; j < n; j++)
		{
			for (h = 0; h<m; h++)
			{
				b[h] += array[j][h];
			}
			max = maxSubArray(b, h);

			if (max>sum)
				sum = max;
		}
	}
	return sum;
}
int main()
{
	int arr[M][N] ;
	printf("随机产生二维数组为\n");
	srand(time(0));
	int i,j;
	for (i = 0; i < M; i++)
	{
		for (j = 0; j < N; j++)
		{
			arr[i][j] = rand() % 100-50;
			printf("%d ",arr[i][j] );
	}
		printf("\n");
	}
	printf("最大子数组和为：%d\n",maxSubMatrix(M, N, arr));
	system("pause");
	return 0;
}