Lexicographically next string

Given a string, find lexicographically next string.

Examples:

Input : geeks
Output : geekt
The last character 's' is changed to 't'.

Input : raavz
Output : raawz
Since we can't increase last character, 
we increment previous character.

Input :  zzz
Output : zzza



If string is empty, we return ‘a’. If string contains all characters as ‘z’, we append ‘a’ at the end. Otherwise we find first character from end which is not z and increment it.

C++

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// C++ program to find lexicographically next
// string
#include <bits/stdc++.h>
using namespace std;
  
string nextWord(string s)
{
    // If string is empty.
    if (s == "")
        return "a";
  
    // Find first character from right 
    // which is not z.
      
    int i = s.length() - 1;
    while (s[i] == 'z' && i >= 0)
        i--;
  
    // If all characters are 'z', append
    // an 'a' at the end.
    if (i == -1) 
        s = s + 'a';
  
    // If there are some non-z characters 
    else
        s[i]++;
  
    return s; 
}
  
// Driver code
int main()
{
    string str = "samez";
    cout << nextWord(str);
    return 0;
}

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Java














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// Java program to find  


// lexicographically next string 


import java.util.*; 


  


class GFG 


{ 


public static String nextWord(String str) 


{ 


      


    // if string is empty 


    if (str == "") 


    return "a"; 


      


    // Find first character from 


    // right which is not z. 


    int i = str.length() - 1; 


    while (str.charAt(i) == 'z' && i >= 0) 


        i--; 


          


    // If all characters are 'z',  


    // append an 'a' at the end. 


    if (i == -1)  


        str = str + 'a'; 


  


// If there are some 


// non-z characters  


else


    str = str.substring(0, i) +  


         (char)((int)(str.charAt(i)) + 1) +  


                      str.substring(i + 1); 


return str;  


} 


  


// Driver Code 


public static void main (String[] args) 


{ 


    String str = "samez"; 


    System.out.print(nextWord(str)); 


} 


} 


  


// This code is contributed  


// by Kirti_Mangal 



















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Python3














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# Python 3 program to find lexicographically 


# next string 


  


def nextWord(s): 


      


    # If string is empty. 


    if (s == " "): 


        return "a"


  


    # Find first character from right  


    # which is not z. 


    i = len(s) - 1


    while (s[i] == 'z' and i >= 0): 


        i -= 1


  


    # If all characters are 'z', append 


    # an 'a' at the end. 


    if (i == -1): 


        s = s + 'a'


  


    # If there are some non-z characters  


    else: 


        s = s.replace(s[i], chr(ord(s[i]) + 1), 1)  


  


    return s 


  


# Driver code 


if __name__ == '__main__': 


    str = "samez"


    print(nextWord(str)) 


      


# This code is contributed by 


# Sanjit_Prasad 



















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C#














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// C# program to find  


// lexicographically next string  


using System; 


  


class GFG 


{ 


public static string nextWord(string str) 


{ 


  


    // if string is empty  


    if (str == "") 


    { 


    return "a"; 


    } 


  


    // Find first character from  


    // right which is not z.  


    int i = str.Length - 1; 


    while (str[i] == 'z' && i >= 0) 


    { 


        i--; 


    } 


  


    // If all characters are 'z',  


    // append an 'a' at the end.  


    if (i == -1) 


    { 


        str = str + 'a'; 


    } 


  


    // If there are some  


    // non-z characters  


    else


    { 


        str = str.Substring(0, i) + 


             (char)((int)(str[i]) + 1) +  


              str.Substring(i + 1); 


    } 


    return str; 


} 


  


// Driver Code  


public static void Main(string[] args) 


{ 


    string str = "samez"; 


    Console.Write(nextWord(str)); 


} 


} 


  


// This code is contributed by Shrikant13 



















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Output:


samfz



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