求最大和的子数组大小的 C++ 程序
给定一个数组,找出总和最大的子数组的长度。
例子 :
Input : a[] = {1, -2, 1, 1, -2, 1}
Output : Length of the subarray is 2
Explanation: Subarray with consecutive elements
and maximum sum will be {1, 1}. So length is 2
Input : ar[] = { -2, -3, 4, -1, -2, 1, 5, -3 }
Output : Length of the subarray is 5
Explanation: Subarray with consecutive elements
and maximum sum will be {4, -1, -2, 1, 5}.
这个问题主要是最大和连续子数组问题的变体。
这个想法是每当此处结束的总和小于 0 时更新起始索引。
C++
// C++ program to print length of the largest
// contiguous array sum
#include
using namespace std;
int maxSubArraySum(int a[], int size)
{
int max_so_far = INT_MIN, max_ending_here = 0,
start =0, end = 0, s=0;
for (int i=0; i< size; i++ )
{
max_ending_here += a[i];
if (max_so_far < max_ending_here)
{
max_so_far = max_ending_here;
start = s;
end = i;
}
if (max_ending_here < 0)
{
max_ending_here = 0;
s = i + 1;
}
}
return (end - start + 1);
}
/*Driver program to test maxSubArraySum*/
int main()
{
int a[] = {-2, -3, 4, -1, -2, 1, 5, -3};
int n = sizeof(a)/sizeof(a[0]);
cout << maxSubArraySum(a, n);
return 0;
}
输出 :
5
有关更多详细信息,请参阅有关具有最大总和的子数组的大小的完整文章!