1.用一个boolean数组prime,N/2大小,用来表示3,5,7,9,11,13,15,17,19...等的奇数(因为偶数不可能成为素数,2除外) 均置为prime[i] = true 2.然后进行判断, i = 0时,由于prime[0]=true(3); 则将数组内 i + (2 * i + 3) * j < sqrt(N) 的数置为false(为合数), prime[3] = (9) ...
和第二种解法的思路类似,将20个数变成布尔类型的数组,计算出二进制数中1的个数当做数组的下标去匹配。 publicintcountPrimeSetBits3(intL,intR){intcount=0;boolean[] arr = {false,false,true,true,false,true,false,true,false,false,false,true,false,true,false,false,false,true,false,true};for(inti=L...
Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation. (Recall that the number of set bits an integer has is the number of 1s present when written in binary. For example, 21 written in...
762. Prime Number of Set Bits in Binary Representation Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation.(Recall that the number of set bits an integer has is the number of 1s presen...
problem 762. Prime Number of Set Bits in Binary Representation solution1: class Solution { public: int countPrimeSetBits(int L, int R) { int res = 0; int bits = 0; for(int i=L; i<=R; i++) { bits = countBits(i); ...
1994. 好子集的数目 题目描述 给你一个整数数组 nums 。如果 nums 的一个子集中,所有元素的乘积可以表示为一个或多个 互不相同的质数 的乘积,那么我们称它为 好子集。比方说,如果 nums = [1, 2, 3, 4] :[2, 3]…
慢慢有一些赞和感谢, 备受鼓舞, 于是我把所做过的题目用一个script跑了一下,编辑成一篇文章。这也是我知乎的第一篇文章, 也是我GitHub(https://github.com/awangdev/LintCode)上面的的算法总结页面。 这个总结页面是这么规划的: 题目名称(答案链接)
示例说明请见LeetCode官网。来源：力扣（LeetCode） 链接：https://leetcode-cn.com/problems/perfect-number/ 著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。解法一：解法一添加一个获取num所有正因子（除了它本身）的方法calculateAllPrimeFactor，返回值是一个List，将返回值所有的元素相加...
Except for the first two numbers, each subsequent number in the sequence must be the sum of the preceding two. For example: "112358" is an additive number because the digits can form an additive sequence: 1, 1, 2, 3, 5, 8. 代码语言:javascript 代码运行次数:0 运行 复制 1 + 1 ...
Provide all my solutions and explanations in Chinese for all the Leetcode coding problems. Same as this: LeetCode All in One 题目讲解汇总(持续更新中...) Note: All explanations are written in Github Issues, please do not create any new issue or pull request in this project since the proble...