2441. Largest Positive Integer That Exists With Its Negative

[F4NT0]

Given an integer array nums that does not contain any zeros, find the largest positive integer k such that -k also exists in the array.

Return the positive integer k. If there is no such integer, return -1.

Example 1:

• Input: nums = [-1,2,-3,3]
• Output: 3
• Explanation: 3 is the only valid k we can find in the array.

Example 2:

• Input: nums = [-1,10,6,7,-7,1]
• Output: 7
• Explanation: Both 1 and 7 have their corresponding negative values in the array. 7 has a larger value.

Example 3:

• Input: nums = [-10,8,6,7,-2,-3]
• Output: -1
• Explanation: There is no a single valid k, we return -1.

Constraints:

• 1 <= nums.length <= 1000
• -1000 <= nums[i] <= 1000
• nums[i] != 0