Video link

Problems

• Click on Show problem tags and do the questions that contains tags of topics we have covered so far.

Easy

• Roman to Integer.
• Happy Number.
• Armstrong Numbers
• Power of Four
• Factorial
• Excel Sheet Column Title
• Maximum Product of Three Numbers
• Climbing Stairs
• Self Dividing Numbers
• Add Binary
• Power of Two

Medium

• Integer to Roman
• Unique Paths
• Gray Code
• Perfect Squares
• Next Greater Element III
• Angle Between Hands of a Clock
• String to Integer (atoi)
• The k^th Factor of n
• Queries on Number of Points Inside a Circle
• Product of Array Except Self
• Multiply Strings
• Encode and Decode TinyURL
• Integer Break

Hard

• Permutation Sequence
• Basic Calculator
• Max Points on a Line
• Number of Digit One