摘要：
题目： Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 阅读全文
摘要：
题目：Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single elem 阅读全文