Flipkart

6 problems asked at Flipkart.

Easy (2)

Two Sum (Leetcode 1)

Two Pointers, Arrays

Valid Parentheses (Leetcode 20)

Stack, Strings

Medium (2)

Gas Station (Leetcode 134)

Arrays, Greedy, Prefix Sum

Min Stack (Leetcode 155)

Stack

Hard (2)

Largest Rectangle in Histogram (leetcode 84)

Arrays, Stack

Trapping Rain Water (LC 42)

Two Pointers, Prefix and Suffix Arrays, Stack