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2441. Largest Positive Integer That Exists With Its Negative 👍

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  int findMaxK(vector<int>& nums) {
    int ans = -1;
    unordered_set<int> seen;

    for (const int num : nums)
      if (seen.count(-num))
        ans = max(ans, abs(num));
      else
        seen.insert(num);

    return ans;
  }
};

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public class Solution {
  public int findMaxK(int[] nums) {
    int ans = -1;
    Set<Integer> seen = new HashSet<>();

    for (final int num : nums)
      if (seen.contains(-num))
        ans = Math.max(ans, Math.abs(num));
      else
        seen.add(num);

    return ans;
  }
}

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class Solution:
  def findMaxK(self, nums: List[int]) -> int:
    ans = -1
    seen = set()

    for num in nums:
      if -num in seen:
        ans = max(ans, abs(num))
      else:
        seen.add(num)

    return ans