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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
using System.Linq;
namespace FirstUniqueNumber
{
class Program
{
static void Main(string[] args)
{
var firstUnique = new FirstUnique(new int[] { 2, 3, 5 });
Console.WriteLine(firstUnique.ShowFirstUnique());
firstUnique.Add(5);
Console.WriteLine(firstUnique.ShowFirstUnique());
firstUnique.Add(2);
Console.WriteLine(firstUnique.ShowFirstUnique());
firstUnique.Add(3);
Console.WriteLine(firstUnique.ShowFirstUnique());
}
}
public class FirstUnique
{
private Dictionary<int, int> record;
public FirstUnique(int[] nums)
{
record = new Dictionary<int, int>();
foreach (var num in nums)
{
if (!record.ContainsKey(num))
record[num] = 1;
else
record[num]++;
}
}
public int ShowFirstUnique()
{
if (record.All(r => r.Value != 1))
return -1;
return record.First(r => r.Value == 1).Key;
}
public void Add(int value)
{
if (!record.ContainsKey(value))
record[value] = 1;
else
record[value]++;
}
}
}