Had a phone screening interview with Meta. Typically it was a 45 minutes long interview and you are supposed to solve two problems in that duration. (20 minutes each). 5 minutes are kept aside for introduction and Q&A at the end.

1. First question was around adding two floating numbers (provided in string format) and returning their sum in string format - Can't use eval or sumation after direct type conversion from string to float.

input: "1.00000000012", "22222.1"  
output: "22223.10000000012"

2. Second question was around finding if the given linked list is a palindrome within O(1) space complexity.
   https://leetcode.com/problems/palindrome-linked-list/

I ran short of time for the first problem and hence didn't make it through.