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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 TwoSumIII
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
public class TwoSum
{
private List<int> nums;
public TwoSum()
{
nums = new List<int>();
}
public void Add(int number)
{
nums.Add(number);
}
public bool Find(int value)
{
var set = new HashSet<int>();
foreach (var num in nums)
{
if (set.Contains(value - num))
return true;
set.Add(num);
}
return false;
}
}
public class TwoSum_Dictionary
{
private Dictionary<int, int> nums;
private HashSet<int> values;
public TwoSum_Dictionary()
{
nums = new Dictionary<int, int>();
values = new HashSet<int>();
}
public void Add(int number)
{
if (!nums.ContainsKey(number))
nums[number] = 0;
nums[number]++;
}
public bool Find(int value)
{
if (values.Contains(value))
return true;
foreach (var kv in nums)
{
if (kv.Key != value - kv.Key && nums.ContainsKey(value - kv.Key) ||
kv.Key == value - kv.Key && kv.Value > 1)
{
values.Add(value);
return true;
}
}
return false;
}
}
}