Data Structures & Algorithms

Arrays/Strings: Given an array of integers, return indices of the two numbers such that they add up to a specific target.

Graphs: Given a list of airline tickets represented by pairs of departure and arrival airports, reconstruct the itinerary in lexical order.

Dynamic Programming: You are climbing a staircase. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?

Trees: Given a binary tree, return the level order traversal of its nodes’ values (i.e., from left to right, level by level).

Data Structures & Algorithms

Arrays/Strings: Given an array of integers, return indices of the two numbers such that they add up to a specific target.

Graphs: Given a list of airline tickets represented by pairs of departure and arrival airports, reconstruct the itinerary in lexical order.

Dynamic Programming: You are climbing a staircase. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?

Trees: Given a binary tree, return the level order traversal of its nodes’ values (i.e., from left to right, level by level).