Create more than one list −// two lists var list1 = new List{3, 4}; var list2 = new List{1, 2, 3};Now, use the Intersect() method to get the common values −var res = list1.Intersect(list2);The following is the complete code −Example Live Demousing System.Collections.Generic; using System.Linq; using System; public class Demo {    public static void Main() {       // two lists       var list1 = new List{3, 4};       var list2 = new List{1, 2, 3};       // common values       var res = list1.Intersect(list2);       foreach(int i in res) {          Console.WriteLine(i);       }    } }Output3

Set three lists −// three lists var list1 = new List{3, 4}; var list2 = new List{1, 2, 3}; var list3 = new List{2, 5, 6};Now, use the Concat mthod to concat the above lists −var res1 = list1.Concat(list2); var res2 = res1.Concat(list3);Here is the complete code −Example Live Demousing System.Collections.Generic; using System.Linq; using System; public class Demo {    public static void Main() {       // three lists       var list1 = new List{3, 4};       var list2 = new List{1, 2, 3};       var list3 = new List{2, 5, 6};       // concat       var res1 = list1.Concat(list2);       var res2 = res1.Concat(list3);       foreach(int i in res2) {          Console.WriteLine(i);       }    } }Output3 4 1 2 3 2 5 6

Firstly, create lists −//three lists var list1 = new List{3, 4, 5}; var list2 = new List{1, 2, 3, 4, 5}; var list3 = new List{5, 6, 7, 8};Use the union method to get the union of list1 and list2 −var res1 = list1.Union(list2); var res2 = res1.Union(list3);The following is the complete code −Example Live Demousing System.Collections.Generic; using System.Linq; using System; public class Demo {    public static void Main() {       //three lists       var list1 = new List{3, 4, 5};       var list2 = new List{1, 2, 3, 4, 5};       var list3 = new List{5, 6, 7, 8};       // finding union       var res1 = list1.Union(list2);       var res2 = res1.Union(list3);       foreach(int i in res2) {          Console.WriteLine(i);       }    } }Output3 4 5 1 2 6 7 8

Firstly, set both the dictionaries −Dictionary < string, int > dict1 = new Dictionary < string, int > (); dict1.Add("water", 1); dict1.Add("food", 2); Dictionary < string, int > dict2 = new Dictionary < string, int > (); dict2.Add("clothing", 3); dict2.Add("shelter", 4);Now, create HashSet and use UnionsWith() method to find the union between the above two Dictionaries −HashSet < string > hSet = new HashSet < string > (dict1.Keys); hSet.UnionWith(dict2.Keys);The following is the complete code −Example Live Demousing System; using System.Collections.Generic; public class Program {    public static void Main() {       Dictionary < string, int > dict1 = ... Read More

Under anagram, another string would have the same characters present in the first string, but the order of characters can be different.Here, we are checking the following two strings −string str1 = "silent"; string str2 = "listen";Convert both the strings into character array −char[] ch1 = str1.ToLower().ToCharArray(); char[] ch2 = str2.ToLower().ToCharArray();Now, sort them −Array.Sort(ch1); Array.Sort(ch2);After sorting, convert them to strings −string val1 = new string(ch1); string val2 = new string(ch2);Compare both the strings for equality. If both are equal, that would mean they are anagrams.The following is the code −Example Live Demousing System; public class Demo {    public static ... Read More

Heterogram for a string means the string isn’t having duplicate letters. For example −Mobile Cry LaptopLoop through each word of the string until the length of the string −for (int i = 0; i < len; i++) {    if (val[str[i] - 'a'] == 0)    val[str[i] - 'a'] = 1;    else    return false; }Above, len is the length of the string.Let us see the complete code −Example Live Demousing System; public class GFG {    static bool checkHeterogram(string str, int len) {       int []val = new int[26];       for (int i ... Read More

Firstly, set the Hex String −string str = "7D";Now, use the Convert.ToSByte() method to convert the Hex string to Hex number −Console.WriteLine(Convert.ToSByte(str, 16));Let us see the complete code −Example Live Demousing System; namespace Demo {    public class Program {       public static void Main(string[] args) {          string str = "7D";          Console.WriteLine(Convert.ToSByte(str, 16));       }    } }Output125Another way of converting Hex String to Hex Number −Example Live Demousing System; namespace Demo {    public class Program {       public static void Main(string[] args) {          string str = "7D";          Console.WriteLine(Convert.ToInt32(str, 16));       }    } }Output125

Firstly, set a tuple −Tuple t = Tuple.Create(99,53);Now, convert the tuple to an array −int[] arr = new int[]{t.Item1, t.Item2};The following is the code to convert a tuple into an array −Example Live Demousing System; using System.Linq; using System.Collections.Generic; namespace Demo {    public class Program {       public static void Main(string[] args) {          Tuple t = Tuple.Create(99,53);          int[] arr = new int[]{t.Item1, t.Item2};          foreach (int val in arr) {             Console.WriteLine(val);          }       }    }   }Output99 53

To get the binary of Decimal, using recursion, firstly set the decimal number −int dec = 30;Now pass the value to a function −public int displayBinary(int dec) { }Now, check the condition until the decimal value is 0 and using recursion get the mod 2 of the decimal num as shown below. The recursive call will call the function again with the dec/2 value −public int displayBinary(int dec) {    int res;    if (dec != 0) {       res = (dec % 2) + 10 * displayBinary(dec / 2);       Console.Write(res);       return ... Read More

To merge two sorted arrays into a list, firstly set two sorted arrays −int[] array1 = { 1, 2 }; int[] array2 = { 3, 4 };Add it to a list and merge −var list = new List(); for (int i = 0; i < array1.Length; i++) {    list.Add(array1[i]);       list.Add(array2[i]); }Now, use the ToArray() method to convert back into an array as shown below −Example Live Demousing System; using System.Collections.Generic; public class Program {    public static void Main() {       int[] array1 = { 56, 70, 77};       int[] array2 = ... Read More