1using System;
2
3class Solution {
4    public int MinOperations(int[] nums, int k) {
5        int xorSum = 0;
6        for (int i = 0; i < nums.Length; i++) {
7            xorSum ^= nums[i];
8        }
9        int diff = xorSum ^ k;
10        int operations = 0;
11        while (diff != 0) {
12            operations += diff & 1;
13            diff >>= 1;
14        }
15        return operations;
16    }
17
18    static void Main(string[] args) {
19        int[] nums = { 2, 1, 3, 4 };
20        int k = 1;
21        Solution solution = new Solution();
22        Console.WriteLine(solution.MinOperations(nums, k));
23    }
24}

1