Snowflake

5 problems asked at Snowflake.

Easy (1)

Two Sum (Leetcode 1)

Two Pointers, Arrays

Medium (2)

Implementation of Deque using Circular Array (Leetcode 641)

Queue, Arrays

Min Stack (Leetcode 155)

Stack

Hard (2)

N-Queens (Leetcode 51 & 52)

Backtracking, Maths, Recursion...

Trapping Rain Water (LC 42)

Two Pointers, Prefix and Suffix Arrays, Stack