IBM

9 problems asked at IBM.

Easy (3)

Leetcode 1710 — Maximum Units on a Truck

Greedy, Sorting

Two Sum (Leetcode 1)

Two Pointers, Arrays

Valid Parentheses (Leetcode 20)

Stack, Strings

Medium (4)

Gas Station (Leetcode 134)

Arrays, Greedy, Prefix Sum

Group Anagrams (Leetcode 49)

Arrays, Strings, Sorting...

Min Stack (Leetcode 155)

Stack

Stock Span Problem (Leetcode 901)

Stack, Arrays, Greedy

Hard (2)

N-Queens (Leetcode 51 & 52)

Backtracking, Maths, Recursion...

Trapping Rain Water (LC 42)

Two Pointers, Prefix and Suffix Arrays, Stack