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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
object Solution {
def maxProduct(arr: Array[Int]): Int = {
var ans = Int.MinValue
var cprod = 1
for (j <- arr) {
cprod = cprod * j
ans = math.max(ans, cprod)
if (cprod == 0) {
cprod = 1
}
}
cprod = 1
for (i <- arr.length - 1 to 0 by -1) {
cprod = cprod * arr(i)
ans = math.max(ans, cprod)
if (cprod == 0) {
cprod = 1
}
}
ans
}
}