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Leetcode 76 minimum windows substring - C# mocking practice, timeout on Leetcode online judge. Last test case timeout
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Leetcode76MinimumWindowSubstring_mocking
{
class Program
{
static void Main(string[] args)
{
}
public static string GetSmallestSubstring(string input, string unique)
{
if(input == null || input.Length == 0 || unique == null || unique.Length == 0)
{
return string.Empty;
}
// assume that input is not empty, unique is not empty
int minimumLength = Int32.MaxValue;
var hashset = new HashSet<char>();
foreach(var item in unique)
{
hashset.Add(item);
}
var dictionary = new Dictionary<char, int>();
int left = 0;
int length = input.Length;
string minimumString = string.Empty;
for(int i = 0; i < length; i++)
{
var visit = input[i];
//put into dictionary
if(dictionary.ContainsKey(visit))
{
dictionary[visit] ++;
}
else
{
dictionary.Add(visit, 1);
}
// if all unique chars is in the dictionary
bool isFound = checkFound(hashset, dictionary);
if(!isFound)
{
continue;
}
while( left < length &&
(!hashset.Contains(input[left]) ||
(dictionary.ContainsKey(input[left]) &&
dictionary[input[left]] > 1)))
{
var current = input[left];
dictionary[current]--;
left ++;
}
var currentLength = i - left + 1;
if( currentLength < minimumLength)
{
minimumLength = currentLength;
minimumString = input.Substring(left, currentLength);
}
left ++;
}
return minimumString;
}
/// <summary>
/// code review on June 30, 2017
/// </summary>
/// <param name="hashset"></param>
/// <param name="dictionary"></param>
/// <returns></returns>
private static bool checkFound(HashSet<char> hashset, Dictionary<char, int> dictionary)
{
foreach (var item in hashset)
{
if (!dictionary.ContainsKey(item) || dictionary[item] == 0)
{
return false;
}
}
return true;
}
}
}
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