Program to find the Encrypted word

Given a string, the given string is an encrypted word, the task is to decrypt the given string to get the original word.

Examples:

Input: str = "abcd"
Output: bdee
Explanation:
a -> a + 1 -> b
b -> b + 2 -> d
c -> c + 2 -> e
d -> d + 1 -> e

Input: str = "xyz"
Output: yaa
Explanation:
x -> x + 1 -> y
y -> y + 2 -> a
z -> z + 1 -> a

Approach:



  • Let the length of the string be n.
  • then the encrypted string will be:
  • Print the string after finding the scrypted word.

Below is the implementation of the above approach:

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// C++ program to implement 
// the above approach
  
#include <bits/stdc++.h>
using namespace std;
  
// Function to find the encrypted string
void findWord(string c, int n)
{
    int co = 0, i;
  
    // to store the encrypted string
    string s(n, ' ');
  
    for (i = 0; i < n; i++) {
        if (i < n / 2)
            co++;
        else
            co = n - i;
  
        // after 'z', it should go to a.
        if (c[i] + co <= 122)
            s[i] = (char)((int)c[i] + co);
        else
            s[i] = (char)((int)c[i] + co - 26);
    }
    cout << s;
}
  
// Driver code
int main()
{
    string s = "abcd";
    findWord(s, s.length());
    return 0;
}

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Output:

bdee

Time Complexity: O(N)



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