Codility Lesson 2-2 Arrays

OddOccurrencesInArray.cs

using System;
// you can also use other imports, for example:
// using System.Collections.Generic;

// you can write to stdout for debugging purposes, e.g.
// Console.WriteLine("this is a debug message");

class Solution {
    public int solution(int[] A) {
        int result = 0;
        foreach(var number in A){
            result ^= number;
        }
 
        return result;
        
        // write your code in C# 6.0 with .NET 4.5 (Mono)
    }
}