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C# program to find all duplicate elements in an integer array
Firstly, set the array with duplicate elements.
int[] arr = { 24, 10, 56, 32, 10, 43, 88, 32 };
Now declare a Dictionary and loop through the array to get the repeated elements.
var d = new Dictionary < int, int > (); foreach(var res in arr) { if (d.ContainsKey(res)) d[res]++; else d[res] = 1; }
Example
using System; using System.Collections.Generic; namespace Demo { public class Program { public static void Main(string[] args) { int[] arr = { 24, 10, 56, 32, 10, 43, 88, 32 }; 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
24 occurred 1 times 10 occurred 2 times 56 occurred 1 times 32 occurred 2 times 43 occurred 1 times 88 occurred 1 times
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