Smallest String With A Given Numeric Value.py

class Solution:
    def getSmallestString(self, n: int, k: int) -> str:
        ans = ['a']*n  # Initialize the answer to be 'aaa'.. length n
        val = n           #Value would be length as all are 'a'
        
        for i in range(n-1, -1, -1):    
            if val == k:           # if value has reached k, we have created our lexicographically smallest string
                break
            val -= 1                # reduce value by one as we are removing 'a' and replacing by a suitable character
            ans[i] = chr(96 + min(k - val, 26))   # replace with a character which is k - value or 'z'
            val += ord(ans[i]) - 96                     # add the value of newly appended character to value
            
        return ''.join(ans)                                 # return the ans string in the by concatenating the list