g0501_0600.s0600_non_negative_integers_without_consecutive_ones

Class Solution

java.lang.Object

g0501_0600.s0600_non_negative_integers_without_consecutive_ones.Solution

public class Solution
extends Object

600 - Non-negative Integers without Consecutive Ones.

Hard

Given a positive integer n, return the number of the integers in the range [0, n] whose binary representations do not contain consecutive ones.

Example 1:

Input: n = 5

Output: 5

Explanation:

Here are the non-negative integers <= 5 with their corresponding binary representations:
0 : 0
1 : 1
2 : 10
3 : 11
4 : 100
5 : 101
Among them, only integer 3 disobeys the rule (two consecutive ones) and the other 5 satisfy the rule. 

Example 2:

Input: n = 1

Output: 2

Example 3:

Input: n = 2

Output: 3

Constraints:

• 1 <= n <= 109

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	findIntegers(int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

findIntegers

public int findIntegers(int n)