Given a string str and an array of strings strArr[], the task is to sort the array according to the alphabetical order defined by str.
Note: str and every string in strArr[] consists of only lower case alphabets.
Examples:
Input: str = “fguecbdavwyxzhijklmnopqrst”,
strArr[] = {“geeksforgeeks”, “is”, “the”, “best”, “place”, “for”, “learning”}
Output: for geeksforgeeks best is learning place theInput: str = “avdfghiwyxzjkecbmnopqrstul”,
strArr[] = {“rainbow”, “consists”, “of”, “colours”}
Output: consists colours of rainbow
Approach: Traverse every character of str and store the value in a map with character as the key and its index in the array as the value.
Now, this map will act as the new alphabetical order of the characters. Start comparing the string in the strArr[] and instead of comparing the ASCII values of the characters, compare the values mapped to those particular characters in the map i.e. if character c1 appears before character c2 in str then c1 < c2.
Below is the implementation of the above approach:
#include <iostream> #include <algorithm> #include <vector> #include <map> using namespace std;
// Map to store the characters with their order // in the new alphabetical order map< char , int > h;
// Function that returns true if x < y // according to the new alphabetical order int Compare(string x, string y)
{ int minSize = min(x.length(), y.length());
for ( int i = 0; i < minSize; i++)
{
if (h[x[i]] == h[y[i]])
continue ;
return h[x[i]] - h[y[i]];
}
return x.length() - y.length();
} // Driver code int main()
{ string str = "fguecbdavwyxzhijklmnopqrst" ;
vector<string> v { "geeksforgeeks" , "is" , "the" , "best" , "place" , "for" , "learning" };
// Store the order for each character
// in the new alphabetical sequence
h.clear();
for ( int i = 0; i < str.length(); i++)
h[str[i]] = i;
sort(v.begin(), v.end(), [](string x, string y) { return Compare(x, y) < 0; });
// Print the strings after sorting
for ( auto x : v)
cout << x << " " ;
return 0;
} |
using System;
using System.Collections.Generic;
class Program
{ // Map to store the characters with their order
// in the new alphabetical order
private static Dictionary< char , int > h = new Dictionary< char , int >();
// Function that returns true if x < y
// according to the new alphabetical order
private static int Compare( string x, string y)
{
int minSize = Math.Min(x.Length, y.Length);
for ( int i = 0; i < minSize; i++)
{
if (h[x[i]] == h[y[i]])
continue ;
return h[x[i]] - h[y[i]];
}
return x.Length - y.Length;
}
// Driver code
static void Main( string [] args)
{
string str = "fguecbdavwyxzhijklmnopqrst" ;
List< string > v = new List< string > { "geeksforgeeks" , "is" , "the" ,
"best" , "place" , "for" , "learning" };
// Store the order for each character
// in the new alphabetical sequence
h.Clear();
for ( int i = 0; i < str.Length; i++)
h[str[i]] = i;
v.Sort((x, y) => Compare(x, y));
// Print the strings after sorting
foreach ( var x in v)
Console.Write(x + " " );
Console.ReadLine();
}
} |
// Java implementation of the approach import java.util.Arrays;
import java.util.Comparator;
public class GFG
{ private static void sort(String[] strArr, String str)
{ Comparator<String> myComp = new Comparator<String>()
{
@Override
public int compare(String a, String b)
{
for ( int i = 0 ;
i < Math.min(a.length(),
b.length()); i++)
{
if (str.indexOf(a.charAt(i)) ==
str.indexOf(b.charAt(i)))
{
continue ;
}
else if (str.indexOf(a.charAt(i)) >
str.indexOf(b.charAt(i)))
{
return 1 ;
}
else
{
return - 1 ;
}
}
return 0 ;
}
};
Arrays.sort(strArr, myComp);
} // Driver Code public static void main(String[] args)
{ String str = "fguecbdavwyxzhijklmnopqrst" ;
String[] strArr = { "geeksforgeeks" , "is" , "the" , "best" ,
"place" , "for" , "learning" };
sort(strArr, str);
for ( int i = 0 ; i < strArr.length; i++)
{
System.out.print(strArr[i] + " " );
}
} } |
# Python3 implementation of the approach # Function to sort and print the array # according to the new alphabetical order def sortStringArray(s, a, n):
# Sort the array according to the new alphabetical order
a = sorted (a, key = lambda word: [s.index(c) for c in word])
for i in a:
print (i, end = ' ' )
# Driver code s = "fguecbdavwyxzhijklmnopqrst"
a = [ "geeksforgeeks" , "is" , "the" , "best" , "place" , "for" , "learning" ]
n = len (a)
sortStringArray(s, a, n) |
<script> // JavaScript implementation of the approach // Map to store the characters with their order // in the new alphabetical order let h = new Map();
// Function that returns true if x < y // according to the new alphabetical order function compare(x, y)
{ for (let i = 0; i < Math.min(x.length, y.length); i++) {
if (h.get(x[i]) == h.get(y[i]))
continue ;
return h.get(x[i]) - h.get(y[i]);
}
return x.length - y.length;
} // Driver code let str = "fguecbdavwyxzhijklmnopqrst" ;
let v = [ "geeksforgeeks" , "is" , "the" , "best" , "place" , "for" , "learning" ];
// Store the order for each character // in the new alphabetical sequence h.clear(); for (let i = 0; i < str.length; i++)
h.set(str[i],i);
v.sort(compare); // Print the strings after sorting for (let x of v)
document.write(x + " " );
// This code is contributed by shinjanpatra </script> |
for geeksforgeeks best is learning place the
Complexity Analysis:
- Time Complexity: O(N * log(N)), where N is the size of the string str
- Auxiliary Space: O(N)