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440. K-th Smallest in Lexicographical Order 字典顺序的第K小数字 #60

Open GH1995 opened 5 years ago

GH1995 commented 5 years ago

440. K-th Smallest in Lexicographical Order

Difficulty: Hard

Given integers n and k, find the lexicographically k-th smallest integer in the range from 1 to n.

Note: 1 ≤ k ≤ n ≤ 109.

Example:

Input:
n: 13   k: 2

Output:
10

Explanation:
The lexicographical order is [1, 10, 11, 12, 13, 2, 3, 4, 5, 6, 7, 8, 9], so the second smallest number is 10.