Change gender of a given string

Change gender of string i.e toggle all the gender-specific words in the input string.
Examples:

Input:  “she is my sister” 
Output:  “he is my brother”.
There are two gender-specific words in this
sentence:“she” and “sister”. After toggling
gender specific words to their respective 
counterparts - “he” and “brother” :
Gender specific words of the string are now 
changed.

Algorithm:

  • Maintain a hash-map which maps all the “female” words to the “male” words and all the “male” words to “female” ones.
  • Then for each word in the string, we check whether this is a gender-specific word or not. If it is then we swap this word with its counterpart word. Else we don’t swap this word.
  • All the words gets concatenated in a new string, which at the end is printed and is our required string.
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// A C++ Program to change the gender of a string
#include<bits/stdc++.h>
using namespace std;
  
// A Funtion that returns the new string with gender
// changed
string changeGender(string str)
{
    // A Dictionary to store the mapping of genders
    // The user can add his words too.
    unordered_multimap <string, string> dictionary =
    {
      {"batman", "batwoman"}, {"batwoman", "batman"},
      {"boy", "girl"}, {"girl", "boy"},
      {"boyfriend", "girlfriend"}, {"girlfriend", "boyfriend"},
      {"father", "mother"}, {"mother", "father"},
      {"husband", "wife"}, {"wife", "husband"},
      {"he", "she"}, {"she", "he"},
      {"his", "her"}, {"her", "his"},
      {"male", "female"}, {"female", "male"},
      {"man", "woman"}, {"woman", "man"},
      {"Mr", "Ms"}, {"Mr", "Ms"},
      {"sir", "madam"}, {"madam", "sir"},
      {"son", "daughter"}, {"daughter", "son"},
      {"uncle", "aunt"}, {"aunt", "uncle"},
    };
  
    str = str + ' '; // Append a space at the end
  
    int n = str.length();
  
    // 'temp' string will hold the intermediate words
    // and 'ans' string will be our result
    string temp = "", ans = "";
  
    for (int i=0; i<=n-1; i++)
    {
        if (str[i] != ' ')
            temp.push_back(str[i]);
        else
        {
            // If this is a 'male' or a 'female' word then
            // swap this with its counterpart
            if (dictionary.find(temp) != dictionary.end())
                temp = dictionary.find(temp)->second;
  
            ans = ans + temp + ' ';
            temp.clear();
        }
    }
  
    return(ans);
}
  
// Driver Program to test above functions
int main()
{
    string str = "she is going to watch movie with"
                " her boyfriend";
  
    cout << changeGender(str);
  
    return (0);
}

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Time Complexity: O(N^2), where N is the length of the string, as the ‘+’/ ‘append’ operator of the string can take upto O(N) time and assuming that lookup in the dictionary takes O(1) worse case time.

Auxiliary Space: Apart from the dictionary that maps all the words to its counterpart, we declare O(N) space for the new string, where N is the length of input string.

Scope for Improvement:

  • We can add more words and their counterparts in the dictionary to increase the accuracy of the program. For example, we can add – “actor , actress” , “god , goddess” to our dictionary.
  • A text file of words of all female and male words can also be imported.
  • The program can be modified to become case insensitive.

This article is contributed by Rachit Belwariar . 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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