题目
The numeric value of a lowercase character is defined as its position (1-indexed) in the alphabet, so the numeric value of a is 1, the numeric value of b is 2, the numeric value of c is 3, and so on.
The numeric value of a string consisting of lowercase characters is defined as the sum of its characters’ numeric values. For example, the numeric value of the string “abe” is equal to 1 + 2 + 5 = 8.
You are given two integers n and k. Return the lexicographically smallest string with length equal to n and numeric value equal to k.
Note that a string x is lexicographically smaller than string y if x comes before y in dictionary order, that is, either x is a prefix of y, or if i is the first position such that x[i] != y[i], then x[i] comes before y[i] in alphabetic order.
解题思路
贪心，前面都放a，后面都放z，z的个数是(k-n)/25
代码
class Solution:
def getSmallestString(self, n: int, k: int) -> str:
d, m = divmod(k - n, 25)
return "a" * (n - 1 - d) + (chr(m + 97) if d != n else "") + "z" * d
