从字典 c# 中删除多余的值

Question

I have the following program to detect duplicate values and print distinct values from an integer array. but the Dictionary value prints one extra line value 0 occurred 95 times <- How to remove this line?

class CheckRepeat
{
    public static void Main()
    {
        int[] a = new int[100];

        int n,i, j;
        Console.Write("\n\nCount total number of duplicate elements in an array:\n");
        Console.Write("---------------------------------------------------------\n");

        Console.Write("Input the number of elements to be stored in the array :");
        n = Convert.ToInt32(Console.ReadLine());

        /*---------------------------------------Input Array-------------------------------------*/
        Console.Write("Input {0} elements in the array :\n", n);
        for (i = 0; i < n; i++)
        {
            Console.Write("element - {0} : ", i);
            a[i] = Convert.ToInt32(Console.ReadLine());
        }
        var dict = new Dictionary<int, int>();
        /*------------------------------------Store Duplicates-----------------------------------*/
        foreach (var value in a)
        {
            if (dict.ContainsKey(value))
                dict[value]++;
            else
                dict[value] = 1;
        }
        /*------------------------------------Show Duplicates-----------------------------------*/
        foreach (var pair in dict)
            Console.WriteLine("Value {0} occurred {1} times.", pair.Key, pair.Value);

        Console.WriteLine("Distinct Values");
        int[] q = a.Distinct().ToArray();
        for (i = 0; i < q.Length-1; i++) 
        {
            Console.WriteLine(q[i]);
        }

        Console.Read();
    }
}

Answer 1

You have two corrections.

First, your Array is declared with Size 100. This would prefill your array with 0s. This is the reason you have the extra element (0) and its count. You could instead create the Array with same size as the desired number of elements.

Console.Write("Input the number of elements to be stored in the array :");
n = Convert.ToInt32(Console.ReadLine());
int[] a = new int[n]; // Change here

Secondly, you need correct loop condition where you print the Distinct Element

use

i < q.Length;

Instead of

 i < q.Length-1;

Complete Loop

for (i = 0; i < q.Length; i++) 
{
   Console.WriteLine(q[i]);
}

Alternate Solution

You could also use List<T> and Linq to make this more simpler. For example,

    Console.Write("Input the number of elements to be stored in the array :");
    n = Convert.ToInt32(Console.ReadLine());
    List<int> a = new List<int>();

    for (i = 0; i < n; i++)
    {
            Console.Write("element - {0} : ", i);
            a.Add(Convert.ToInt32(Console.ReadLine()));
    }

    var dict = a.GroupBy(x=>x).ToDictionary(x=>x.Key,y=>y.Count());

    Console.WriteLine("Duplicates");
    foreach(var pair in dict)
    {
        Console.WriteLine($"{pair.Key} occured {pair.Value} times");
    }

    Console.WriteLine("Distinct");
    foreach(var pair in dict)
    {
        Console.WriteLine($"{pair.Key}");
    }