Given two integers N and K. The task is to print the lexicographically smallest string of length N consisting of lower-case English alphabates such that the sum of the characters of the string equals to K where ‘a’ = 1, ‘b’ = 2, ‘c’ = 3, ….. and ‘z’ = 26.
Input: N = 5, K = 42
“aaany”, “babmx”, “aablz” etc. are also valid strings
but “aaamz” is the lexicographically smallest.
Input: N = 3, K = 25
- Initialize char array of size N and fill all the element by ‘a’.
- Start traversing from the end of the array and replace the elements of the array by ‘z’ if K ≥ 26 or replace it by the character having ASCII value (K + 97 – 1).
- At the same time decrease the value of K by replaced element value i.e. for a = 1, b = 2, c = 3, …, z = 26.
- Also, note that we are subtracting previous element value i.e. (total ‘a’) before current element and adding the same before the end of for loop.
- Check for K < 0 condition and break the for loop.
- Return the new string formed by the elements of the char array as the answer.
Below is the implementation of the above approach:
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