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                                        leetcode-Ugly Number

                                        3/8/2017來源:ASP.NET技巧人氣:10419

                                        Question:

                                        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 example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

                                        Note that 1 is typically treated as an ugly number.

                                        Solution:

                                        class Solution { public: bool isUgly(int num) { if(num == 0){ return false; } while(num != 1){ if(num %2 != 0 && num %3 != 0 && num % 5 != 0){ return false; } if(num%2 == 0){ num /= 2; } if(num%3 == 0){ num /= 3; } if(num%5 == 0){ num /= 5; } } return true; } };

                                        總結:

                                        注意while判斷條件是num!=1,而不是 num != 0



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