6204. Largest Positive Integer That Exists With Its Negative

https://leetcode.com/contest/weekly-contest-315/problems/largest-positive-integer-that-exists-with-its-negative/

• Contest 315

Python

class Solution:
    def findMaxK(self, nums: List[int]) -> int:
        nums = set(nums)

        ans = -1
        for num in nums:
            if -num in nums:
                ans = max(ans, num)
        return ans