Citadel

Best Position for a Service Centre

Count Palindromic Subsequences

Delete and Earn

Design a Real-Time Stock Trading System

Also asked at Snowflake

Design a Ring Buffer with Backpressure and Multiple Consumers

Also asked at Coinbase

Evaluate Division

Also asked at Jane Street

First Completely Painted Row or Column

LFU Cache

Longest String Chain

Also asked at Two Sigma

Maximum Length of Repeated Subarray

Maximum Total Damage With Spell Casting

Merge Intervals

Also asked at Amazon, Apple +9

Minimum Costs Using the Train Line

Minimum Equal Sum of Two Arrays After Replacing Zeros

Minimum Knight Moves

Also asked at Uber, Waymo

Minimum Operations to Make Numbers Non-positive

Number of Good Binary Strings

Palindromic Substrings

Sliding Window Maximum

Also asked at MongoDB, NVIDIA