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Grokking the Coding Interview Patterns

Problem: Counting Bits

Medium
30 min
Explore how to return an array counting the number of 1s in the binary form of integers up to n. Understand the dynamic programming approach to optimize solving this common interview problem.

Statement

For a given positive integer, n, your task is to return an array of length n+1n+1 such that for each xx where 0≤x≤n0 \leq x \leq n, result[x] is the count of 11s in the binary representation of xx.

Constraints:

  • 0≤n≤1040 \leq n \leq 10^4
Similar Problems
The Number of Good Subsets
0/1 Knapsack
Coin Change
N-th Tribonacci Number
Partition Equal Subset Sum
01 Matrix
House Robber II
Maximum Product Subarray
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Word Break
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Problem
Ask
Submissions
Home
Courses
Grokking the Coding Interview Patterns

Problem: Counting Bits

Medium
30 min
Explore how to return an array counting the number of 1s in the binary form of integers up to n. Understand the dynamic programming approach to optimize solving this common interview problem.

Statement

For a given positive integer, n, your task is to return an array of length n+1n+1 such that for each xx where 0≤x≤n0 \leq x \leq n, result[x] is the count of 11s in the binary representation of xx.

Constraints:

  • 0≤n≤1040 \leq n \leq 10^4
Similar Problems
The Number of Good Subsets
0/1 Knapsack
Coin Change
N-th Tribonacci Number
Partition Equal Subset Sum
01 Matrix
House Robber II
Maximum Product Subarray
Combination Sum
Word Break