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3474. Lexicographically Smallest Generated String

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Роман Пытков
2026-04-01 11:28:34 +03:00
parent 3b9bbfe3db
commit 3d490d6027
4 changed files with 121 additions and 0 deletions
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11
3474. Lexicographically Smallest Generated String/3474. Lexicographically Smallest Generated String.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>_3474._Lexicographically_Smallest_Generated_String</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

9
3474. Lexicographically Smallest Generated String/Program.cs Normal file
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@@ -0,0 +1,9 @@
var sol = new Solution();
// System.Console.WriteLine($"TFTF | ab -> \"{sol.GenerateString("TFTF", "ab")}\"");
// System.Console.WriteLine($"TFTF | abc -> \"{sol.GenerateString("TFTF", "abc")}\"");
// System.Console.WriteLine($"F | d -> \"{sol.GenerateString("F", "d")}\"");
// System.Console.WriteLine($"F | da -> \"{sol.GenerateString("F", "da")}\"");
// System.Console.WriteLine($"FT | da -> \"{sol.GenerateString("FT", "aghbdfhf")}\"");
// System.Console.WriteLine($"TFFFTFFF | bab -> \"{sol.GenerateString("TFFFTFFF", "bab")}\"");
System.Console.WriteLine($"TFT | xx -> \"{sol.GenerateString("TFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFTFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFTFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFT", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")}\"");

87
3474. Lexicographically Smallest Generated String/Solution.cs Normal file
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@@ -0,0 +1,87 @@
using System.Text;
public class Solution
{
public string GenerateString(string str1, string str2)
{
var len = str1.Length + str2.Length - 1;
var answer = new char[len];
// Сначала обработать все T
for (var i = 0; i < str1.Length; i++)
{
if (str1[i] == 'T')
{
var sbIdx = i;
for (var j = 0; j < str2.Length; j++)
{
if (answer[sbIdx] != 0 && answer[sbIdx] != str2[j])
return "";
answer[sbIdx++] = str2[j];
}
}
}
// Теперь обработать все F
var canChange = new bool[len];
var lastF = -1;
for (var i = 0; i < str1.Length; i++)
if (str1[i] == 'F')
{
if (ProcessF(answer.AsSpan()[i..(i + str2.Length)], str2, canChange.AsSpan()[i..(i + str2.Length)], out var goBack) == false)
return "";
if(goBack && lastF != -1)
i = lastF - 1;
else
lastF = i;
}
return new string(answer);
}
private bool ProcessF(Span<char> chars, string s2, Span<bool> canChange, out bool goBack)
{
goBack = false;
var equal = true;
var emptyCount = 0;
var hasDiff = false;
var lastCanChange = -1;
for (var i = 0; i < s2.Length; i++)
{
equal &= chars[i] == s2[i];
if (chars[i] == 0)
emptyCount++;
else if (chars[i] != s2[i])
hasDiff = true;
if (canChange[i])
lastCanChange = i;
}
if (equal)
{
if (lastCanChange >= 0)
{
chars[lastCanChange]++;
if (chars[lastCanChange] == 'z' + 1)
chars[lastCanChange] = 'a';
goBack = true;
return true;
}
else
return false;
}
for (var i = 0; i < chars.Length && emptyCount > 0; i++)
{
if (chars[i] != 0)
continue;
var insert = 'a';
if (emptyCount == 1 && s2[i] == insert && !hasDiff)
insert++;
chars[i] = insert;
canChange[i] = true;
if (s2[i] != insert)
hasDiff = true;
emptyCount--;
}
return true;
}
}

14
Leetcode.sln
View File

@@ -203,6 +203,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "2946. Matrix Similarity Aft
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "2840. Check if Strings Can be Made Equal With Operations II", "2840. Check if Strings Can be Made Equal With Operations II\2840. Check if Strings Can be Made Equal With Operations II.csproj", "{5020405E-5F4F-4AC6-932D-00F01643A2F0}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "3474. Lexicographically Smallest Generated String", "3474. Lexicographically Smallest Generated String\3474. Lexicographically Smallest Generated String.csproj", "{7493B586-527C-4D54-A048-2E9B96B52A6E}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -1413,6 +1415,18 @@ Global
{5020405E-5F4F-4AC6-932D-00F01643A2F0}.Release|x64.Build.0 = Release|Any CPU
{5020405E-5F4F-4AC6-932D-00F01643A2F0}.Release|x86.ActiveCfg = Release|Any CPU
{5020405E-5F4F-4AC6-932D-00F01643A2F0}.Release|x86.Build.0 = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|x64.ActiveCfg = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|x64.Build.0 = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|x86.ActiveCfg = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Debug|x86.Build.0 = Debug|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|Any CPU.Build.0 = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|x64.ActiveCfg = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|x64.Build.0 = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|x86.ActiveCfg = Release|Any CPU
{7493B586-527C-4D54-A048-2E9B96B52A6E}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE