Sort Array By Parity

LeetCode https://leetcode.cn/problems/sort-array-by-parity/

class Solution {
    public int[] sortArrayByParity(int[] nums) {
        int n = nums.length;
        int[] res = new int[n];
        int left = 0, right = n - 1;
        for (int num : nums) {
            if (num % 2 == 0) {
                res[left++] = num;
            } else {
                res[right--] = num;
            }
        }
        return res;
    }
}

Complexity

• Time = O(n)
• Space = O(1)

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