LeetCode contest 191 5424. 数组中两元素的最大乘积

Table of Contents

一、中文版

二、英文版

三、My answer

四、解题报告


一、中文版

给你一个整数数组 nums,请你选择数组的两个不同下标 i 和 j使 (nums[i]-1)*(nums[j]-1) 取得最大值。

请你计算并返回该式的最大值。

示例 1:

输入:nums = [3,4,5,2]
输出:12 
解释:如果选择下标 i=1 和 j=2(下标从 0 开始),则可以获得最大值,(nums[1]-1)*(nums[2]-1) = (4-1)*(5-1) = 3*4 = 12 。 

示例 2:

输入:nums = [1,5,4,5]
输出:16
解释:选择下标 i=1 和 j=3(下标从 0 开始),则可以获得最大值 (5-1)*(5-1) = 16 。

示例 3:

输入:nums = [3,7]
输出:12

提示:

  • 2 <= nums.length <= 500
  • 1 <= nums[i] <= 10^3

二、英文版

Given the array of integers nums, you will choose two different indices i and j of that array. Return the maximum value of (nums[i]-1)*(nums[j]-1).

Example 1:

Input: nums = [3,4,5,2]
Output: 12 
Explanation: If you choose the indices i=1 and j=2 (indexed from 0), you will get the maximum value, that is, (nums[1]-1)*(nums[2]-1) = (4-1)*(5-1) = 3*4 = 12. 

Example 2:

Input: nums = [1,5,4,5]
Output: 16
Explanation: Choosing the indices i=1 and j=3 (indexed from 0), you will get the maximum value of (5-1)*(5-1) = 16.

Example 3:

Input: nums = [3,7]
Output: 12

Constraints:

  • 2 <= nums.length <= 500
  • 1 <= nums[i] <= 10^3

三、My answer

class Solution:
    def maxProduct(self, nums: List[int]) -> int:

        res = 0
        for i in range(len(nums)):
            for j in range(1,len(nums)):
                if i != j and (nums[i]-1) * (nums[j]-1) > res:
                    res = (nums[i]-1) * (nums[j]-1)
        return res

四、解题报告

直接遍历不会超时,所以可以双重 for 循环。

class Solution:
    def maxProduct(self, nums: List[int]) -> int:

        nums.sort()
        return (nums[-1]-1)*(nums[-2]-1)

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转载自blog.csdn.net/u011675334/article/details/106453194