Walmart Labs

7 problems asked at Walmart Labs.

Easy (2)

Two Sum (Leetcode 1)

Two Pointers, Arrays

Valid Parentheses (Leetcode 20)

Stack, Strings

Medium (1)

Min Stack (Leetcode 155)

Stack

Hard (4)

Largest Rectangle in Histogram (leetcode 84)

Arrays, Stack

N-Queens (Leetcode 51 & 52)

Backtracking, Maths, Recursion...

Repeating Element (Cycle + Expected Sum appr.)

Arrays, Two Pointers, Linked Lists

Trapping Rain Water (LC 42)

Two Pointers, Prefix and Suffix Arrays, Stack