Generate two output strings depending upon occurrence of character in input string.

Given an input string str[], generate two output strings. One of which consists of those character which occurs only once in input string and second which consists of multi-time occurring characters. Output strings must be sorted.

Examples:

Input : str[] = "geeksforgeeks"
Output : String with characters occurring once:
for
String with characters occurring multiple times:
egks

Input : str[] = "geekspractice"
Output : String with characters occurring once:
agikprst
String with characters occurring multiple times:
ce

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach : We follow total two steps to generate the both output strings.
Step 1: Create a count array and count occurrences of characters in the given input string.
Step 2: Check count array for each position ‘i’ which leads to three possible conditions :
a) If count value is 1, append character in first output string.
b) If count value is greater than 1, append character in second output string.
c) If count value is 0 do nothing.

Time Complexity for above approach is O(n).
Auxiliary Space required is O(1).

C++

// CPP program to print two strings 
// made of character occurring once  
// and multiple times 
#include <bits/stdc++.h> 
using namespace std; 
  
const int MAX_CHAR = 256; 
  
// function to print two strings  
// generated from single string one 
// with characters occurring onces  
// other with character occurring  
// multiple of times 
void printDuo(string &str) 
{ 
    // initialize hashtable with zero  
    // entry 
    int countChar[MAX_CHAR] = { 0 }; 
  
    // perform hashing for input string 
    int n = str.length(); 
    for (int i = 0; i < n; i++) 
        countChar[str[i] - 'a']++; 
  
    // generate string (str1) consisting  
    // char occurring once and string  
    // (str2) consisting char occurring  
    // multiple times 
    string str1 = "", str2 = "";   
    for (int i = 0; i < MAX_CHAR; i++) { 
        if (countChar[i] > 1) 
            str2 = str2 + (char)(i + 'a'); 
        else if (countChar[i] == 1) 
            str1 = str1 + (char)(i + 'a'); 
    } 
  
    // print both strings 
    cout << "String with characters occurring "
         <<  "once:\n"; 
    cout << str1 << "\n"; 
    cout << "String with characters occurring " 
         << "multiple times:\n"; 
    cout << str2 << "\n"; 
} 
  
// driver program 
int main() 
{ 
    string str = "lovetocode"; 
    printDuo(str); 
    return 0; 
} 

Java

// Java program to print two strings  
// made of character occurring once  
// and multiple times  
  
class GFG { 
  
    final static int MAX_CHAR = 256; 
  
// function to print two strings  
// generated from single string one  
// with characters occurring onces  
// other with character occurring  
// multiple of times  
    static void printDuo(String str) { 
        // initialize hashtable with zero  
        // entry  
        int countChar[] = new int[MAX_CHAR]; 
  
        // perform hashing for input string  
        int n = str.length(); 
        for (int i = 0; i < n; i++) { 
            countChar[str.charAt(i) - 'a']++; 
        } 
  
        // generate string (str1) consisting  
        // char occurring once and string  
        // (str2) consisting char occurring  
        // multiple times  
        String str1 = "", str2 = ""; 
        for (int i = 0; i < MAX_CHAR; i++) { 
            if (countChar[i] > 1) { 
                str2 = str2 + (char) (i + 'a'); 
            } else if (countChar[i] == 1) { 
                str1 = str1 + (char) (i + 'a'); 
            } 
        } 
  
        // print both strings  
        System.out.print("String with characters occurring "
                + "once:\n"); 
        System.out.print(str1 + "\n"); 
        System.out.print("String with characters occurring "
                + "multiple times:\n"); 
        System.out.print(str2 + "\n"); 
        System.out.print(""); 
    } 
  
// driver program  
    public static void main(String[] args) { 
        String str = "lovetocode"; 
        printDuo(str); 
  
    } 
} 
//this code contributed by 29AJayKumar 

Python3

# Python3 program to print two strings 
# made of character occurring once  
# and multiple times 
  
MAX_CHAR = 256
  
# function to print two strings  
# generated from single string one 
# with characters occurring onces  
# other with character occurring  
# multiple of times 
def printDuo(string): 
  
    # initialize hashtable with zero  
    # entry 
    countChar = [0 for i in range(MAX_CHAR)]  
  
    # perform hashing for input string 
    n = len(string) 
    for i in range(n): 
        countChar[ord(string[i]) - ord('a')] += 1
  
    # generate string (str1) consisting  
    # char occurring once and string  
    # (str2) consisting char occurring  
    # multiple times 
    str1 = "" 
    str2 = ""  
    for i in range(MAX_CHAR):  
        if (countChar[i] > 1): 
            str2 = str2 + chr(i + ord('a')) 
        elif (countChar[i] == 1): 
            str1 = str1 + chr(i + ord('a')) 
      
    # print both strings 
    print("String with characters occurring once:",  
                                        "\n", str1) 
    print("String with characters occurring",  
               "multiple times:", "\n", str2) 
  
# Driver Code 
string = "lovetocode"
printDuo(string) 
  
# This code is contributed by 
# Mohit kumar 29 

C#

// C# program to print two strings  
// made of character occurring once  
// and multiple times  
using System; 
  
class GFG  
{ 
static int MAX_CHAR = 256; 
  
// function to print two strings  
// generated from single string one  
// with characters occurring onces  
// other with character occurring  
// multiple of times  
static void printDuo(string str) 
{ 
    // initialize hashtable with zero  
    // entry  
    int[] countChar = new int[MAX_CHAR]; 
  
    // perform hashing for input string  
    int n = str.Length; 
    for (int i = 0; i < n; i++) 
    { 
        countChar[str[i] - 'a']++; 
    } 
  
    // generate string (str1) consisting  
    // char occurring once and string  
    // (str2) consisting char occurring  
    // multiple times  
    string str1 = "", str2 = ""; 
    for (int i = 0; i < MAX_CHAR; i++) 
    { 
        if (countChar[i] > 1) 
        { 
            str2 = str2 + (char) (i + 'a'); 
        }  
        else if (countChar[i] == 1) 
        { 
            str1 = str1 + (char) (i + 'a'); 
        } 
    } 
  
    // print both strings  
    Console.Write("String with characters "+  
                       "occurring once:\n"); 
    Console.Write(str1 + "\n"); 
    Console.Write("String with characters occurring " +  
                                  "multiple times:\n"); 
    Console.Write(str2 + "\n"); 
    Console.Write(""); 
} 
  
// Driver Code 
public static void Main()  
{ 
    string str = "lovetocode"; 
    printDuo(str); 
} 
} 
  
// This code is contributed by ita_c 

Output:

String with characters occurring once:
cdltv
String with characters occurring multiple times:
eo

This article is contributed by Shivam Pradhan (anuj_charm). If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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Recommended: Please try your approach on {IDE} first, before moving on to the solution.

C++

Java

Python3

C#

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