problem0786

README

786. K-th Smallest Prime Fraction

题目

A sorted list A contains 1, plus some number of primes. Then, for every p < q in the list, we consider the fraction p/q.

What is the K-th smallest fraction considered? Return your answer as an array of ints, where answer[0] = p and answer[1] = q.

Examples:
Input: A = [1, 2, 3, 5], K = 3
Output: [2, 5]
Explanation:
The fractions to be considered in sorted order are:
1/5, 1/3, 2/5, 1/2, 3/5, 2/3.
The third fraction is 2/5.

Input: A = [1, 7], K = 1
Output: [1, 7]

Note:

1. A will have length between 2 and 2000.
2. Each A[i] will be between 1 and 30000.
3. K will be between 1 and A.length * (A.length - 1) / 2.

解题思路

见程序注释