Practice set

Practice trading a little extra memory for a faster search through a sequence.

• Hash map
• Array

Use a last-in-first-out structure to reason about nested delimiters.

• Stack
• String

Track a running opportunity while scanning time-ordered values once.

• Array
• Greedy

Narrow a sorted search space by repeatedly choosing a midpoint.

• Binary search
• Array

Order ranges and combine neighboring spans when their boundaries overlap.

• Sorting
• Intervals