stringCodes.cpp

#include <iostream>

using namespace std;

char digToChar(int n)
{
    return n + 'a' - 1;
}

void stringCodes(char inp[], int be, char ansSoFar[], int i)
{
    if(inp[be] == '\0')
    {
        ansSoFar[i] = '\0'; // dabba band karna na bhule
        cout<<ansSoFar<<", ";
        return;
    }

    // simple print
    
    int num = inp[be] - '0';
    char ch = digToChar(num);
    ansSoFar[i] = ch;
    stringCodes(inp, be+1, ansSoFar, i+1);
    
    //
    if(inp[be+1] != '\0')
    {
        
        int n = (inp[be]-'0')*10 + inp[be+1]-'0';
        
        if(n <= 26)
        {
            ansSoFar[i] = digToChar(n);
            stringCodes(inp, be+2, ansSoFar, i+1);
        }
    }
    
    else
        return;

}

int main()
{
    char inp[10];
    cin>>inp;
    char ansSoFar[10];

    cout<<"[";
    stringCodes(inp, 0, ansSoFar, 0);
    
}