Mastercard

4 problems asked at Mastercard.

Easy (2)

Two Sum (Leetcode 1)

Two Pointers, Arrays

Valid Parentheses (Leetcode 20)

Stack, Strings

Medium (1)

Gas Station (Leetcode 134)

Arrays, Greedy, Prefix Sum

Hard (1)

N-Queens (Leetcode 51 & 52)

Backtracking, Maths, Recursion...