Problem: Strobogrammatic Number

15 min

Explore how to use the two-pointer approach to determine if a given number is strobogrammatic, meaning it appears the same when rotated 180 degrees. This lesson helps you apply logical steps to verify these numbers in strings while practicing efficient problem-solving strategies.

Statement

Given a string num representing an integer, determine whether it is a strobogrammatic number. Return TRUE if the number is strobogrammatic or FALSE if it is not.

Note: A strobogrammatic number appears the same when rotated $180$ degrees (viewed upside down). For example, “69” is strobogrammatic because it looks the same when flipped upside down, while “962” is not.

Constraints:

$1 <=$ num.length $<= 50$
num contains only digits.
num has no leading zeros except when the number itself is zero.

Problem: Strobogrammatic Number

15 min

Statement

Given a string num representing an integer, determine whether it is a strobogrammatic number. Return TRUE if the number is strobogrammatic or FALSE if it is not.

Note: A strobogrammatic number appears the same when rotated $180$ degrees (viewed upside down). For example, “69” is strobogrammatic because it looks the same when flipped upside down, while “962” is not.

Constraints:

$1 <=$ num.length $<= 50$
num contains only digits.
num has no leading zeros except when the number itself is zero.

Problem: Strobogrammatic Number

Statement

Examples

Understand the problem

Figure it out!

Try it yourself

Problem: Strobogrammatic Number

Statement

Examples

Understand the problem

Figure it out!

Try it yourself