add: 找出给定数组的最大乘积的子数组

dengshasha · Nov 7, 2022 · 593598d · 593598d
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diff --git a/README.md b/README.md
@@ -96,6 +96,7 @@
 22. [判断是否是数独](https://github.com/dengshasha/algorithm-study/blob/master/array/validSudoku.js) || [leetcode地址](https://leetcode.com/problems/valid-sudoku/submissions/)
 23. [找出两个数组的公共元素](https://github.com/dengshasha/algorithm-study/blob/master/array/IntersectionOfTwoArr.js) || [leetcode地址](https://leetcode.com/problems/intersection-of-two-arrays-ii/)
 24. [Game of life](https://github.com/dengshasha/algorithm-study/blob/master/array/gameOfLife.js) || [leetcode地址](https://leetcode.com/problems/game-of-life)
+25. [找出给定数组的最大乘积的子数组](https://github.com/dengshasha/algorithm-study/blob/master/array/maxProductSubarr.js) || [leetcode地址](https://leetcode.com/problems/maximum-product-subarray/)
 
 
 ### 动态规划

diff --git a/array/maxProductSubarr.js b/array/maxProductSubarr.js
@@ -0,0 +1,39 @@
+/**
+ * Created by dengxuelian on 2022/11/7
+ */
+
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+// 解法1：暴力解法（会超时）
+var maxProduct = function(nums) {
+    let product = nums[0];
+    for(let i = 1; i < nums.length; i++) {
+        let cur = nums[i]
+        product = Math.max(product, cur)
+        for(let j = i-1; j >= 0; j--) {
+            cur *= nums[j]
+            product = Math.max(product, cur)
+        }
+    }
+    return product;
+};
+
+var maxProduct_1 = function(nums) {
+    let min = nums[0], max = nums[0], product = nums[0]
+    for(let i = 1; i < nums.length; i++) {
+        if(nums[i] < 0) {
+            let temp = min
+            min = max;
+            max = temp;
+        }
+        min = Math.min(nums[i] * min, nums[i])
+        max = Math.max(nums[i] * max, nums[i])
+        product = Math.max(product, max)
+    }
+    return product
+}
+console.log('6:', maxProduct_1([2,3,-2,4]))
+console.log('2:', maxProduct_1([0,2,0]))
+console.log('24:', maxProduct_1([2,-5,-2,-4,3]))
diff --git a/index.html b/index.html
@@ -6,6 +6,6 @@
     <title>Document</title>
 </head>
 <body>
-    <script src="array/gameOfLife.js"></script>
+    <script src="array/maxProductSubarr.js"></script>
 </body>
 </html>