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561. Array Partition 👍

  • Time: $O(n) \to O(\texttt{sort})$
  • Space: $O(1) \to O(\texttt{sort})$
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class Solution {
 public:
  int arrayPairSum(vector<int>& nums) {
    int ans = 0;

    ranges::sort(nums);

    for (int i = 0; i < nums.size(); i += 2)
      ans += nums[i];

    return ans;
  }
};

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class Solution {
  public int arrayPairSum(int[] nums) {
    int ans = 0;

    Arrays.sort(nums);

    for (int i = 0; i < nums.length; i += 2)
      ans += nums[i];

    return ans;
  }
}

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class Solution:
  def arrayPairSum(self, nums: List[int]) -> int:
    return sum(sorted(nums)[::2])