Tesla

4 problems asked at Tesla.

Easy (2)

Two Sum (Leetcode 1)

Two Pointers, Arrays

Valid Parentheses (Leetcode 20)

Stack, Strings

Hard (2)

Postfix to Infix & Evaluation of Postfix (Leetcode 150)

Stack

Trapping Rain Water (LC 42)

Two Pointers, Prefix and Suffix Arrays, Stack