2441. Largest Positive Integer That Exists With Its Negative

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題目敘述

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.

解題思路

Solution

import java.util.Arrays;

class Solution {
    public int findMaxK(int[] nums) {
        Arrays.sort(nums);
        
        int i = 0;
        int j = nums.length - 1;

        while (i != j) {
            if (nums[i] + nums[j] == 0) {
                return nums[j];
            } else if (nums[i] + nums[j] > 0) {
                j--;
            } else {
                i++;
            }
        }

        return -1;
    }
}