Grokking the Coding Interview: Patterns for Coding Questions
Ask Author
Back to course home

0% completed

Vote For New Content
Solution: Number factors
Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Problem Statement

Given a number 'n', implement a method to count how many possible ways there are to express 'n' as the sum of 1, 3, or 4.

Example 1:

n : 4
Number of ways = 4
Explanation: Following are the four ways we can express 'n' : {1,1,1,1}, {1,3}, {3,1}, {4}

Example 2:

n : 5
Number of ways = 6
Explanation: Following are the six ways we can express 'n' : {1,1,1,1,1}, {1,1,3}, {1,3,1}, {3,1,1}, 
{1,4}, {4,1}

Let's first start with a recursive brute-force solution.

.....

.....

.....

Like the course? Get enrolled and start learning!

Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible