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How to check if array contains a duplicate number using C#?
Firstly, set an array −
int[] arr = {
87,
55,
23,
87,
45,
23,
98
};Now declare a dictionary and loop through the array and get the count of all the elements. The value you get from the dictionary displays the occurrence of numbers −
foreach(var count in arr) {
if (dict.ContainsKey(count))
dict[count]++;
else
dict[count] = 1;
}Let us see the complete example −
Example
using System;
using System.Collections.Generic;
namespace Demo {
public class Program {
public static void Main(string[] args) {
int[] arr = {
87,
55,
23,
87,
45,
23,
98
};
var dict = new Dictionary < int, int > ();
foreach(var count in arr) {
if (dict.ContainsKey(count))
dict[count]++;
else
dict[count] = 1;
}
foreach(var val in dict)
Console.WriteLine("{0} occurred {1} times", val.Key, val.Value);
}
}
}
Updated on: 22-Jun-2020
856 Views
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