How to Solve Counting Bits Problem
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Counting Bits
Given an integer n, return an array ans of length n + 1 such that for each i (0 <= i <= n), ans[i] is the number of 1's in the binary representation of i.
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Understanding the Counting Bits Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an integer n, return an array ans of length n + 1 such that for each i (0 <= i <= n), ans[i] is the number of 1's in the binary representation of i.
Counting Bits
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How Interview Coder Helps
Get real-time assistance for Counting Bits problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
n = 2[0,1,1]0 --> 0 1 --> 1 2 --> 10
n = 5[0,1,1,2,1,2]0 --> 0 1 --> 1 2 --> 10 3 --> 11 4 --> 100 5 --> 101
Constraints
0 <= n <= 105Follow up:It is very easy to come up with a solution with a runtime of O(n log n). Can you do it in linear time O(n) and possibly in a single pass?Can you do it without using any built-in function (i.e., like __builtin_popcount in C++)?How Interview Coder Helps with Leetcode Problems
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Frequently Asked Questions
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