What is the alphanumeric abbreviation for a string in a C program?

Here we will see an interesting problem related to alphanumeric abbreviation of a given string. String length is less than 10. We will print out all alphanumeric abbreviations.

Alphanumeric abbreviations are formed by a mixture of characters and numbers. The value of this number is the number of characters that were omitted. There may be any number of omitted substrings. No two substrings are adjacent. Let's look at the algorithm for obtaining this concept.

Algorithm

printAbbreviation(s, index, max, str) −

begin
   if index is same as max, then
      print str
   end if
   add s[index] at the last of str
   printAbbreviation(s, index + 1, max, str)
   delete last character from str
   count := 1
   if str is not empty, then
      if the last character of str is a digit, then
         add last digit with the count value
         delete last character from str
      end if
   end if
   add count after the str
   printAbbreveation(s, index + 1, max, str)
end

Example

#include <iostream>
using namespace std;
void printAbbreviation(const string& s, int index, int max_index, string str) {
   if (index == max_index) { //if string has ended
      cout << str << endl;
      return;
   }
   str.push_back(s[index]); // push the current character to result
   printAbbreviation(s, index + 1, max_index, str); //print from next index
   str.pop_back(); //remove last character
   int count = 1;
   if (!str.empty()) {
      if (isdigit(str.back())) { //if the last one is digit, then
         count += (int)(str.back() - &#39;0&#39;); //count the integer value of that digit
         str.pop_back(); //remove last character
      }
   }
   char to_char = (char)(count + &#39;0&#39;); //make count to character
   str.push_back(to_char);
   printAbbreviation(s, index + 1, max_index, str); //do for next index
}
void printCombination(string str) {
   if (!str.length()) //if the string is empty
      return;
   string str_res;
   printAbbreviation(str, 0, str.length(), str_res);
}
int main() {
   string str = "HELLO";
   printCombination(str);
}

Output

HELLO
HELL1
HEL1O
HEL2
HE1LO
HE1L1
HE2O
HE3
H1LLO
H1LL1
H1L1O
H1L2
H2LO
H2L1
H3O
H4
1ELLO
1ELL1
1EL1O
1EL2
1E1LO
1E1L1
1E2O
1E3
2LLO
2LL1
2L1O
2L2
3LO
3L1
4O
5

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