C#解leetcode 152. Maximum Product Subarray
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.
分析:这个题目就是让你求连续的子数组的乘积的最大值。
(1)在数组中没有0的情况下,最大值要么是nums[0]+nums[1]+。。。。+nums[i]或者是nums[j]+nums[j+1]+。。。。+nums[n-1].
当数组中全是整数的时候,或者又偶数个负数的时候,答案为nums[0]+nums[1]+。。。。+nums[n-1]
(2)在数组中有0个情况下,假设nums[i]=0.则答案应该从nums[0]+nums[1]+。。。。+nums[i-1]或者是nums[i+1]+nums[i+2]+。。。。+nums[n-1]中寻找(假设只有一个零的情况,至于当有n个零的时候,将数组分成n+1个子数组就可以了)
代码如下:
public class Solution {
public int MaxProduct(int[] nums) {
int max= int.MinValue,front=,back=;
for(int i=;i<nums.Length;i++)
{
front*=nums[i];
back*=nums[nums.Length-i-];
max=Math.Max(max,Math.Max(front,back));
front=front==?:front;
back=back==?:back;
}
return max;
}
}
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