How to check if an array contains any item of another array

Question

Given 2 int arrays e.g, foo and bar, what\'s the most efficient way to check that the array bar contains at least one item that foo contains. should re

Answer 1

static void Main(string[] args)


    int[] arr1 = { 16, 48, 40, 32, 5, 7 };
    int[] arr2 = { 48, 32, 16, 40, 56, 72, 16, 16, 16, 16, 16, 5, 7, 6, 56 };
    int k = 0;
    for (int i = 0; i < arr1.Length; i++)
    {

        for (int j = 0; j < arr2.Length; j++)
        {

            if (arr1[i] == arr2[j])
            {
                k++;
                break;
            }

        }

    }
    if (arr1.Length == k)
    {
        Console.WriteLine(true);
    }
    else
        Console.WriteLine(false);
}
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