Let’s say our string is −var str = "welcome";Use the substring() method and the following, if you want to rotate only some characters. Here, we are rotating only 2 characters −var res = str.Substring(1, str.Length - 1) + str.Substring(0, 2);The following is the complete code −Example Live Demousing System; public class Program {    public static void Main() {       var str = "welcome";       Console.WriteLine("Original String = "+str);       var res = str.Substring(1, str.Length - 1) + str.Substring(0, 2);       Console.WriteLine("Rotating two characters in the String: "+res);    } }OutputOriginal String = welcome Rotating two characters in the String: elcomewe

To merge two sorted arrays, firstly set two sorted arrays −int[] array1 = { 1, 2 }; int[] array2 = { 3, 4 };Now, 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]); }Use the ToArray() method to convert back into an array −int[] array3 = list.ToArray();The following is the complete code −Example Live Demousing System; using System.Collections.Generic; public class Program {    public static void Main() {       int[] array1 = { 1, 2 };       int[] array2 ... Read More

Use the UnionWith method in C# to get the union of i.e. unique lements from two collections.Let’s say the following are our Dictionary −Dictionary < string, int > dict1 = new Dictionary < string, int > (); dict1.Add("pencil", 1); dict1.Add("pen", 2); Dictionary < string, int > dict2 = new Dictionary < string, int > (); dict2.Add("pen", 3);Now, use HashSet and UnionWith to get the union −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() {   ... Read More

The Union method gets the unique elements from both the lists.Let us set two lists −var list1 = new List{12, 65, 88, 45}; var list2 = new List{40, 34, 65};Now get the union of both the lists −var res = list1.Union(list2);The following is the example −Example Live Demousing System.Collections.Generic; using System.Linq; using System; public class Demo {    public static void Main() {       // two lists       var list1 = new List{12, 65, 88, 45};       var list2 = new List{40, 34, 65};       // finding union       var res = list1.Union(list2);       foreach(int i in res) {          Console.WriteLine(i);       }    } }Output12 65 88 45 40 34

To concat lists in C#, ue the Concat method.The following is the list −var list1 = new List{12, 40}; var list2 = new List{98, 122, 199, 230};Here is the Concat method −var res = list1.Concat(list2);The following is the example to work with Concat method −Example Live Demousing System.Collections.Generic; using System.Linq; using System; public class Demo {    public static void Main() {       // two lists       var list1 = new List{12, 40};       var list2 = new List{98, 122, 199, 230};           // concat       var res = list1.Concat(list2);       foreach(int i in res) {          Console.WriteLine(i);       }    } }Output12 40 98 122 199 230

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