2 
Add Two Numbers 
Medium 
Linked List 
Math

7 
Reverse Integer 
Easy 
Math

8 
String to Integer (atoi) 
Medium 
Math

String

9 
Palindrome Number 
Easy 
Math

12 
Integer to Roman 
Medium 
Math

String

13 
Roman to Integer 
Easy 
Math

String

29 
Divide Two Integers 
Medium 
Math

Binary Search

43 
Multiply Strings 
Medium 
Math

String

1104 
Path In Zigzag Labelled Binary Tree 
Medium 
Math

Tree

1276 
Number of Burgers with No Waste of Ingredients 
Medium 
Math

Greedy

1281 
Subtract the Product and Sum of Digits of an Integer 
Easy 
Math

1317 
Convert Integer to the Sum of Two NoZero Integers 
Easy 
Math

1390 
Four Divisors 
Medium 
Math

1735 
Count Ways to Make Array With Product 
Hard 
Math

1766 
Tree of Coprimes 
Hard 
Math

Tree

Depthfirst Search

Breadthfirst Search
