Problem:
Find the contiguous subarray within an array (containing at least one number) which has the largest sum.
For example, given the array [−2,1,−3,4,−1,2,1,−5,4]
,
the contiguous subarray [4,−1,2,1]
has
the largest sum = 6
.
考虑只有负数的数组的最大子数组和,时间复杂度O(n)。
class Solution {
public:
int maxSubArray(int A[], int n) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
if (A == NULL || n == 0)
return 0;
int maxSum = A[0];
int endSum = 0;
for (int i = 0; i < n; ++i)
{
if (endSum >= 0)
{
endSum += A[i];
}
else
{
endSum = A[i];
}
if(maxSum < endSum)
{
maxSum = endSum;
}
}
return maxSum;
}
};