Given a positive integer n, find the number of non-negative integers less than or equal to n, whose binary representations do NOT contain consecutive ones. Example 1: Input: 5 Output: 5 Explanation: Here are the non-negative integers <= 5 with their…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

Leetcode600 很简单的一道计数题 给定整数n 求不大于n的正整数中 二进制表示没有连续的1的数字个数 在dp过程中只要保证不出现连续1以及大于n的情况即可. 所以设计按位dp[i][j]表示到第i位 j=0表示第i位为0 且值等于n的情况 2为值小于n的情况 j=1表示第i位为1 且值等于n的情况 3为值小于n的情况 转移方程很简单 看代码吧 这道题应该是Mid难度吧 class Solution { public: int findIntegers(int num) { int va…

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example,Given [100, 4, 200, 1, 3, 2],The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4. Your algorithm should run in…

Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1] are both considered valid, but the path [1,2,4,3] is not v…

n位二进制,求不包含连续1的二进制(n位)数字个数. http://www.geeksforgeeks.org/count-number-binary-strings-without-consecutive-1s/ 也可以令f[i],表示共i位的二进制数字中,不包含连续1的二进制(i位)数字的个数. f[i]的组成有两部分: 最高位为1:只有当次高位为0,且满足条件的二进制数字个数,即 f[i-2] 最高位为0:次高位为0或1且满足条件的数字个数,即f[i-1] 得: f[i] = f[i-2]…

题目描述: Longest Consecutive Sequence(最长连续序列) 中文: 给定一个未排序的整数数组,找出最长连续序列的长度. 要求算法的时间复杂度为 O(n). 英文: Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. class Solu…

Given a positive integer n, find the number of non-negativeintegers less than or equal to n, whose binary representations do NOT contain consecutive ones. Example 1: Input: 5 Output: 5 Explanation: Here are the non-negative integers <= 5 with their c…

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [100, 4, 200, 1, 3, 2], The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4. Your algorithm should run i…

Given a positive integer n, find the number of non-negative integers less than or equal to n, whose binary representations do NOT contain consecutive ones. Example 1: Input: 5 Output: 5 Explanation: Here are the non-negative integers <= 5 with their…