Problem: Happy Number

15 min

Explore the fast and slow pointer method to check if a number is a happy number by repeatedly summing the squares of its digits. Understand how to detect cycles efficiently within this process. This lesson equips you to solve cycle detection problems relevant to coding interviews and improve your problem-solving skills.

Statement

Write an algorithm to determine if a number $n$ is a happy number.

We use the following process to check if a given number is a happy number:

Starting with the given number $n$ , replace the number with the sum of the squares of its digits.
Repeat the process until:
- The number equals $1$ , which will depict that the given number $n$ is a happy number.
- The number enters a cycle, which will depict that the given number $n$ is not a happy number.

Return TRUE if $n$ is a happy number, and FALSE if not.

Constraints

$1 \leq$ $n$ $\leq 2^{31} - 1$

Problem: Happy Number

15 min

Statement

Write an algorithm to determine if a number $n$ is a happy number.

We use the following process to check if a given number is a happy number:

Starting with the given number $n$ , replace the number with the sum of the squares of its digits.
Repeat the process until:
- The number equals $1$ , which will depict that the given number $n$ is a happy number.
- The number enters a cycle, which will depict that the given number $n$ is not a happy number.

Return TRUE if $n$ is a happy number, and FALSE if not.

Constraints

$1 \leq$ $n$ $\leq 2^{31} - 1$

Problem: Happy Number

Statement

Examples

Understand the problem

Figure it out

Try it yourself

Problem: Happy Number

Statement

Examples

Understand the problem

Figure it out

Try it yourself