LeetCode-in-All
152. Maximum Product Subarray
Medium
Given an integer array nums, find a contiguous non-empty subarray within the array that has the largest product, and return the product.
It is guaranteed that the answer will fit in a 32-bit integer.
A subarray is a contiguous subsequence of the array.
Example 1:
Input: nums = [2,3,-2,4]
Output: 6
Explanation: [2,3] has the largest product 6.
Example 2:
Input: nums = [-2,0,-1]
Output: 0
Explanation: The result cannot be 2, because [-2,-1] is not a subarray.
Constraints:
1 <= nums.length <= 2 * 104-10 <= nums[i] <= 10- The product of any prefix or suffix of
numsis guaranteed to fit in a 32-bit integer.
Solution
public class Solution {
public int MaxProduct(int[] nums) {
int ans = int.MinValue;
int cprod = 1;
foreach (int j in nums) {
cprod = cprod * j;
ans = Math.Max(ans, cprod);
if (cprod == 0) {
cprod = 1;
}
}
cprod = 1;
for (int i = nums.Length - 1; i >= 0; i--) {
cprod = cprod * nums[i];
ans = Math.Max(ans, cprod);
if (cprod == 0) {
cprod = 1;
}
}
return ans;
}
}