leetcode_668. Kth Smallest Number in Multiplication Table ? 待解决

Nearly every one have used the Multiplication Table. But could you find out the k-th smallest number quickly from the multiplication table?

Given the height m and the length n of a m * n Multiplication Table, and a positive integer k, you need to return the k-th smallest number in this table.

Example 1:

Input: m = 3, n = 3, k = 5

Output:

Explanation:

The Multiplication Table:

1 2 3

2 4 6

3 6 9

The 5-th smallest number is 3 (1, 2, 2, 3, 3).

Example 2:

Input: m = 2, n = 3, k = 6

Output:

Explanation:

The Multiplication Table:

1 2 3

2 4 6

The 6-th smallest number is 6 (1, 2, 2, 3, 4, 6).

Note:

The m and n will be in the range [1, 30000].

The k will be in the range [1, m * n]

提示：提交代码后，需要用简洁的语言解释一下代码思路~ 谢谢

历史题目和总结见公众号「每日一道算法题」

https://leetcode.com/problems/kth-smallest-number-in-multiplication-table/description/

思路：