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题目： Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For 阅读全文
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题目： Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these edges 阅读全文
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题目： Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two eleme 阅读全文