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C# program to find if an array contains duplicate
Set an array −
int[] arr = { 89, 12, 56, 89, };
Now, create a new Dictionary −
var d = new Dictionary < int, int > ();
Using the dictionary method ContainsKey(), find the duplicate elements in the array −
foreach(var res in arr) { if (d.ContainsKey(res)) d[res]++; else d[res] = 1; }
Here is the complete code −
Example
using System; using System.Collections.Generic; namespace Demo { public class Program { public static void Main(string[] args) { int[] arr = { 89, 12, 56, 89, }; var d = new Dictionary < int, int > (); foreach(var res in arr) { if (d.ContainsKey(res)) d[res]++; else d[res] = 1; } foreach(var val in d) Console.WriteLine("{0} occurred {1} times", val.Key, val.Value); } } }
Output
89 occurred 2 times 12 occurred 1 times 56 occurred 1 times
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