排序过后,依次讨论前三个,后三个,以及后两个跟第一个,前两个跟最后一个。注意负数!!
Given an integer array, find three numbers whose product is maximum and output the maximum product.
Example 1:
Input: [1,2,3] Output: 6
Example 2:
Input: [1,2,3,4] Output: 24
Note:
- The length of the given array will be in range [3,104] and all elements are in the range [-1000, 1000].
- Multiplication of any three numbers in the input won't exceed the range of 32-bit signed integer.
public class Solution {
public int maximumProduct(int[] nums) {
Arrays.sort(nums);
int max, n;
n=nums.length;
max=nums[0]*nums[1]*nums[2];
max=Math.max(max,nums[n-3]*nums[n-2]*nums[n-1]);
max=Math.max(max,nums[0]*nums[1]*nums[n-1]);
max=Math.max(max,nums[0]*nums[n-1]*nums[n-2]);
return max;
}
}
本文介绍了一种算法,用于从整数数组中找到三个数的组合,使得这三个数的乘积达到最大值。该算法首先对数组进行排序,然后通过比较不同组合的最大乘积来确定最终结果。
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