Maximum Product of Two Elements in an Array
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
思路一：冒泡排序，整个数组只排两次
public int maxProduct(int[] nums) {
for (int i = 0; i < 2; i++) {
for (int j = 1; j < nums.length; j++) {
if (nums[j] < nums[j - 1]) {
int temp = nums[j];
nums[j] = nums[j - 1];
nums[j - 1] = temp;
}
}
}
return (nums[nums.length - 1] - 1) * (nums[nums.length - 2] - 1);
}