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LeetCode:Maximum Product Subarray

题目描述:

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(因为数组里面可能存在负数),同时记录下得到的所有最大值中最大的。循环结束时,得到的所有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;}


LeetCode:Maximum Product Subarray