题目就是: Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function shoul…
Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should retu…
Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should retu…
题目要求 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 i…
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 bin…
Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation. Note: The given integer is guaranteed to fit within the range of a 32-bit signed integer. You could assume no leading ze…
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by…
题目要求 Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values. 题目分析及思路 给定一个正整数,判断它的二进制形式是否是01交替出现.如果是则返回True,否则返回False.可以先获得该数的二进制形式,之后利用切片分别获得其奇数位和偶数位的值.若全为1或0,则是满足要求的数. python代码…
思路:动态规划.注意1024*1024>10^6,所以质素范围是(0,23). class Solution { public int countPrimeSetBits(int L, int R) { Set<Integer> prime = new HashSet<Integer>(Arrays.asList(2,3,5,7,11,13,17,19,23)); int[] count = new int[1+R]; int res = 0; for(int i = 1;…
