Leetcode 3621. Number of Integers With Popcount-Depth Equal to K I

Count how many integers x in [1, n] take exactly k repeated applications of popcount (number of 1-bits) to reach 1 — equivalently, classify numbers by their initial popcount that lead to a depth k. The core challenge is mapping the popcount chain (k ≤ 5) and counting bit-strings ≤ n with those popcounts efficiently using combinatorics/binomial coefficients or a bitwise digit-DP since n can be large (up to 1e15).

Question Timeline

See when this question was last asked and where, including any notes left by other candidates.

Company

Level

Region

Comments

Your account is free and you can post anonymously if you choose.

Hello Interview Premium

Recent interview questions

System Design Guided Practice

Exclusive content

Learn More

Leetcode 3621. Number of Integers With Popcount-Depth Equal to K I

Question Timeline

Comments

Questions

Learn

Links

Legal

Contact