Find the contiguous subarray within an array (containing at least one number) which has the largest product.
- For example, given the array [2,3,-2,4],
the contiguous subarray [2,3] has the largest product = 6. - 最大子串的乘积,主要是用到了动态规划的算法。C++ Code 如下:
class Solution {
public:
int maxProduct(int a[], int n) {
int *max = new int[n];
int *min = new int[n];
max[0] = a[0];
min[0] = a[0];
int product = max[0];
for (int i=1; i<n; i++)
{
max[i] = MaxinThree(a[i], a[i]*max[i-1], a[i]*min[i-1]);
min[i] = MininThree(a[i], a[i]*max[i-1], a[i]*min[i-1]);
if (max[i] > product)
product = max[i];
}
delete [] max;
delete [] min;
return product;
}
int MaxinThree(int num1, int num2, int num3)
{
int temp = num1 > num2 ? num1 : num2;
return temp > num3 ? temp: num3;
}
int MininThree(int num1, int num2, int num3)
{
int temp = num1 < num2 ? num1 : num2;
return temp < num3 ? temp: num3;
}
};