LeetCode笔记:728. Self Dividing Numbers

2021-11-23 16:41:10 浏览数 (1)

问题(Easy):

A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-dividing number because 128 % 1 == 0, 128 % 2 == 0, and 128 % 8 == 0. Also, a self-dividing number is not allowed to contain the digit zero. Given a lower and upper number bound, output a list of every possible self dividing number, including the bounds if possible. Example 1: Input: left = 1, right = 22 Output: [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 15, 22] Note: The boundaries of each input argument are 1 <= left <= right <= 10000.

大意:

一个自分数是指能够被自己包含的每个数字整除的数。 比如说,128就是个自分数,因为 128 % 1 == 0, 128 % 2 == 0, 并且 128 % 8 == 0。 同时,一个自分数不允许包含数字0。 给出一个数字区间,输出其中所有自分数的清单,包含区间两端的数。 例1: 输入: left=1,right=22; 输出: [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 15, 22] 注意: 每个输入参数的范围为 1 <= left <= right <= 10000。

思路:

只需要遍历区间内所有数字,对每个数依次得到每一位的数字,然后试试能不能整除就可以了,很简单,这里我把判断的代码写到另一个函数里,看起来更清晰。

本来还考虑了如果区间包含负数和0该怎么办,后来发现题目说明了都是正数,那就更容易了。

代码(C ):

代码语言:javascript复制
class Solution {
public:
    bool isselfDividing(int num) {
        if (num == 0) return false;
        int origin = num;
        while (abs(num)  > 0) {
            int temp = num % 10;
            if (temp == 0) return false;
            if (origin % temp != 0) return false;
            num = num / 10;
        }
        return true;
    }
    
    vector<int> selfDividingNumbers(int left, int right) {
        vector<int> res;
        for (int i = left; i <= right; i  ) {
            if (isselfDividing(i)) res.push_back(i);
        }
        return res;
    }
};

合集:https://github.com/Cloudox/LeetCode-Record

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