counting sort
counting sort is one of the most repeated interview dimensions. Start with edge-safe fundamentals, then move into pattern-level trade-offs.
Interview Signal
Frequently tests problem modeling, edge handling, and verbal clarity.
Common Pitfall
Template-only answers break under follow-up questioning.
Practice Strategy
Practice in 3-5 problem rounds and always review complexity alternatives.
Recommended Progression
Pattern Bridge
High-Pressure Round
H-Index
Determine a researcher's h-index by analyzing citations using array sorting and counting techniques efficiently and accu…
Array Partition
Maximize the sum of minimums of n pairs in a 2n integer array using a greedy pairing strategy efficiently.
Sort an Array
Sort an array using an optimal algorithm, focusing on time and space complexity considerations.
Height Checker
Determine how many students are out of place in a line by comparing their heights to the sorted expected order efficient…
Relative Sort Array
Sort arr1 by the relative order of arr2, with remaining elements placed in ascending order.
How Many Numbers Are Smaller Than the Current Number
In this problem, you need to determine how many numbers are smaller than each element in an array, focusing on array sca…
Maximum Ice Cream Bars
Maximize the number of ice cream bars a boy can buy by applying a greedy choice strategy based on cost sorting.
Minimum Number of Moves to Seat Everyone
Calculate the minimum total moves to seat each student using greedy assignment and invariant validation efficiently.
Smallest Palindromic Rearrangement I
Build the smallest palindrome by sorting the left half counts and mirroring them around the optional middle character.