## Monday, February 17, 2014

### Anagram Solver

I was coding out a simple string permuting function and I thought of writing out an AnagramSolver just for completion.

The Dictionary can be provided as a wordlist in the form of a text file with a word string per line. You can find several word lists here: http://wordlist.sourceforge.net/

[code language="cpp"]

//Sources
#include<iostream>
#include<string>
#include<fstream>
#include<map>

using namespace std;
class AnagramChecker
{
public:
map<string, bool> Dictionary;
map<string, bool> ResultList;

//Recursive string permuter
void RecurveStrPerm(string Buffer, string Test, int Cur)
{
if (Cur >= Test.length())
{
if (Dictionary.count(Buffer) > 0)
if (ResultList.count(Buffer) == 0)
ResultList[Buffer] = true;
return;
}

for(int i = 0; i <= Buffer.length(); i++)
{
Buffer.insert(i, 1, Test[Cur]);
RecurveStrPerm(Buffer, Test, Cur + 1);
Buffer.erase(i, 1);
}
}

//Build a table out of the strings
void BuildInMemDic()
{
Dictionary.clear();
string CurrentWord= "";
{
for (int i = 0; i < CurrentWord.length(); i++)
CurrentWord[i] = tolower(CurrentWord[i]);
Dictionary[CurrentWord] = true;

}
}

//Get Result
void GetResult()
{
cout << "\nAnagrams: \n";
for (map<string, bool>::iterator ResultListPtr = ResultList.begin(); ResultListPtr != ResultList.end(); ResultListPtr++)
cout << "\n" << ResultListPtr->first;

}

public:

AnagramChecker()
{
BuildInMemDic();
}

void Find(string Test)
{
ResultList.clear();
int cur = 0, n = Test.length();
RecurveStrPerm("", Test, 0);
GetResult();
}

};

void main()
{
string Test = "Slate";
cout << "\nBuilding In memory Dictionary...";
AnagramChecker AnaObj;
cout << "\n\nInmemory dictionary built!...\n\n";

char ExitChoice = 'n';
while (ExitChoice!='y')
{
cout << "\n\nEnter Anagram: ";
cin >> Test;
for (int i = 0; i < Test.length(); i++)
Test[i] = tolower(Test[i]);

cout << "\n\nAnagrams for " << Test << ":\n\n";
AnaObj.Find(Test);
cout << "\n\nDo you want to continue: y /n :";
cin >> ExitChoice;

}
cout << "\nEnd of code\n";
system("pause");
return;
}

[/code]

The code is NOT optimized. It can be sped up with simple multi-threading, but I have let go of those for simplicity.