Your Dashboard
Interview Coaching
Learn
System Design
ML System Design
Code
Behavioral
Salary Negotiation
Interview Guides
Search
⌘K
Get Premium
Leetcode 1680. Concatenation of Consecutive Binary Numbers
Return the decimal value (mod 1e9+7) of the binary string formed by concatenating the binary representations of 1..n. The core challenge is to do this efficiently by appending each number using shifts/multiplication by 2^{bit-length} (bit-lengths increase at powers of two) rather than building the full string, with n up to 1e5.
Question Timeline
See when this question was last asked and where, including any notes left by other candidates.
All Regions
Comments
Hello Interview Premium
Your account is free and you can post anonymously if you choose.