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C# program to check if two lists have at-least one element common
Set the first list.
int[] arr1 = {
65,
57,
63,
98
};Now, set the second list.
int[] arr2 = {
43,
65,
33,
57
};Let us now see the complete code to check if two lists have common elements using == and < operators.
Example
using System;
using System.Collections.Generic;
using System.Linq;
public class Program {
public static void Main() {
int[] arr1 = {
65,
57,
63,
98
};
int[] arr2 = {
43,
65,
33,
57
};
// HashSet One
var h1 = new HashSet < int > (arr1);
// HashSet Two
var h2 = new HashSet < int > (arr2);
// Displaying
int[] val1 = h1.ToArray();
Console.WriteLine("Set one...");
foreach(int val in val1) {
Console.WriteLine(val);
}
//Displaying
int[] val2 = h2.ToArray();
Console.WriteLine("Set two...");
foreach(int val in val2) {
Console.WriteLine(val);
}
int i = 0, j = 0;
Console.WriteLine("Common elements:");
while (i < val1.Length && j < val2.Length) {
if (val1[i] == val2[j]) {
Console.Write(val1[i] + " ");
i++;
j++;
} else if (val1[i] < val2[j])
i++;
else
j++;
}
}
}Output
Set one... 65 57 63 98 Set two... 43 65 33 57 Common elements: 65 57
Updated on: 22-Jun-2020
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