LeetCode — Non-negative Integers without Consecutive Ones

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.
Input: n = 1
Output: 2
Input: n = 2
Output: 3
  • 1 <= n <= 109

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