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LeetCode 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
.
minLast[i] 表示以A[i]结尾的最小值,maxLast[i]表示以A[i]结尾的最大值。
minLast[i] = Math.min(A[i], Math.min(minLast[i - 1]*A[i], maxLast[i - 1]*A[i]));
maxLast[i] = Math.max(A[i], Math.max(maxLast[i - 1]*A[i], minLast[i - 1]*A[i]));
1 public class Solution { 2 public int maxProduct(int[] A) { 3 int length = A.length; 4 if (length == 0) { 5 return 0; 6 } 7 int[] minLast = new int[length]; 8 int[] maxLast = new int[length]; 9 minLast[0] = A[0];10 maxLast[0] = A[0];11 int res = Integer.MIN_VALUE;12 for (int i = 1; i <length ; i++) {13 minLast[i] = Math.min(A[i], Math.min(minLast[i - 1]*A[i], maxLast[i - 1]*A[i]));14 maxLast[i] = Math.max(A[i], Math.max(maxLast[i - 1]*A[i], minLast[i - 1]*A[i]));15 }16 for (int i : maxLast) {17 if (i>res) res = i;18 }19 return res;20 }21 }
LeetCode Maximum Product Subarray
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