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30. Substring with Concatenation of All Words

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Роман Пытков
2026-03-25 23:58:01 +03:00
parent 6b483ea6d1
commit 4681660c8c
5 changed files with 80 additions and 1 deletions
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2
114. Flatten Binary Tree to Linked List/Program.cs
View File

@@ -22,7 +22,7 @@ static TreeNode? BuildTreeFromLevelOrder(int?[] data)
if (data.Length == 0 || data[0] == null)
return null;
var root = new TreeNode(data[0].Value);
var root = new TreeNode(data[0]!.Value);
var queue = new Queue<TreeNode>();
queue.Enqueue(root);

11
30. Substring with Concatenation of All Words/30. Substring with Concatenation of All Words.csproj Normal file
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@@ -0,0 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<RootNamespace>_30._Substring_with_Concatenation_of_All_Words</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

18
30. Substring with Concatenation of All Words/Program.cs Normal file
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@@ -0,0 +1,18 @@
var sol = new Solution();
var cases = new (string s, string[] words, int[] expected)[]
{
// ("barfoothefoobarman", new[] { "foo", "bar" }, new[] { 0, 9 }),
// ("wordgoodgoodgoodbestword", new[] { "word", "good", "best", "word" }, Array.Empty<int>()),
// ("barfoofoobarthefoobarman", new[] { "bar", "foo", "the" }, new[] { 6, 9, 12 }),
("wordgoodgoodgoodbestword", new[] { "word", "good", "best", "good" }, new[] { 8 })
};
string Format(IEnumerable<int> values) => $"[{string.Join(",", values)}]";
string FormatWords(IEnumerable<string> values) => $"[{string.Join(",", values)}]";
foreach (var (s, words, expected) in cases)
{
var actual = sol.FindSubstring(s, words);
Console.WriteLine($"{s} | {FormatWords(words)} -> {Format(actual)} (expected: {Format(expected)})");
}

36
30. Substring with Concatenation of All Words/Solution.cs Normal file
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@@ -0,0 +1,36 @@
public class Solution {
public IList<int> FindSubstring(string s, string[] words) {
var len = words[0].Length;
var allLen = len*words.Length;
var dict = new Dictionary<string, int>();
foreach(var word in words)
{
dict.TryAdd(word, 0);
dict[word]++;
}
var answer = new List<int>();
var dictClone = new Dictionary<string, int>(dict);
for(var i = 0; i < s.Length-allLen+1; i++)
{
var valid = 0;
foreach (var kvp in dictClone)
dictClone[kvp.Key] = dict[kvp.Key];
for(var j=i; j < i+allLen; j+=len)
{
var word = s[j..(j+len)];
if(dictClone.TryGetValue(word, out var count) && count > 0)
{
dictClone[word]--;
valid++;
}
else
{
break;
}
}
if(valid == words.Length)
answer.Add(i);
}
return answer;
}
}

14
Leetcode.sln
View File

@@ -195,6 +195,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "32. Longest Valid Parenthes
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "114. Flatten Binary Tree to Linked List", "114. Flatten Binary Tree to Linked List\114. Flatten Binary Tree to Linked List.csproj", "{D86CCC06-597D-4DF8-8DCC-E7804E773530}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "30. Substring with Concatenation of All Words", "30. Substring with Concatenation of All Words\30. Substring with Concatenation of All Words.csproj", "{DC410457-B769-4597-857D-5AAD2BDBAAC3}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -1357,6 +1359,18 @@ Global
{D86CCC06-597D-4DF8-8DCC-E7804E773530}.Release|x64.Build.0 = Release|Any CPU
{D86CCC06-597D-4DF8-8DCC-E7804E773530}.Release|x86.ActiveCfg = Release|Any CPU
{D86CCC06-597D-4DF8-8DCC-E7804E773530}.Release|x86.Build.0 = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|Any CPU.Build.0 = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|x64.ActiveCfg = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|x64.Build.0 = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|x86.ActiveCfg = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Debug|x86.Build.0 = Debug|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|Any CPU.ActiveCfg = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|Any CPU.Build.0 = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|x64.ActiveCfg = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|x64.Build.0 = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|x86.ActiveCfg = Release|Any CPU
{DC410457-B769-4597-857D-5AAD2BDBAAC3}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE