Given a string S consisting of N characters and an array M[] of pairs of characters such that any character M[i][0] may be changed with the character M[i][1] within the string S, the duty is to generate all of the doable strings shaped by changing some characters of the string with their respective symbols within the array M[].
Examples:
Enter: S = “aBc”, M = {‘a’ : ‘$’, ‘B’ : ‘#’, ‘c’ : ‘^’}
Output:
aBc
aB^
a#c
a#^
$Bc
$B^
$#c
$#^Enter: S = “a”, M={‘a’ : ‘$’}
Output:
a
$
Strategy: The given downside may be solved by utilizing Backtracking to generate all doable strings by changing every character with the mapped character within the array M[]. Comply with the steps beneath to resolve the issue:
- Retailer all of the pairs of the mapped characters within the array M[] in a map, say Map.
- Outline a recursive perform say generateLetters(S, P), the place S is the modified string and P is the index of the present character:
- Test for the bottom case i.e., if index P equals to the N then print the string S and return.
- Don’t change the present character and recursively name for the perform, generateLetters(S, P + 1).
- Now, change the character, S[P] with the respective image within the map M and name for the perform, generateLetters(S, P+1).
- After finishing the above steps, name for the perform generateLetters(S, 0) to print all doable strings.
Under is the implementation of the above method:
C++
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aBc aB^ a#c a#^ $Bc $B^ $#c $#^
Time Complexity: O(N*2N)
Auxiliary House: O(1)
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