LeetCode:Maximum Product Subarray
标题叙述性说明:
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
思路:从左至右遍历数组,记录下以当前所遍历到的元素结尾的子数组积的最大值和最小值(由于数组里面可能存在负数),同一时候记录下得到的全部最大值中最大的。循环结束时。得到的全部最大值中最大的即为所求。
代码:
int Solution::maxProduct(int A[],int n) { if(n == 1) return A[0]; int max_temp = A[0]; int min_temp = A[0]; int result = A[0]; int i; for(i = 1;i < n;i++) { int max_temp2 = max_temp * A[i]; int min_temp2 = min_temp * A[i]; max_temp = max(max_temp2,max(min_temp2,A[i])); min_temp = min(min_temp2,min(max_temp2,A[i])); if(max_temp > result) result = max_temp; } return result; }
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