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Quick recall

374 cards

Coding Exercises Easy O(n + m)

Convert both arrays to sets, take the union, and sort the result if stable output is helpful.

Return the unique values that appear in either array.

#arrays #python #set

Coding Exercises Easy O(n)

Push opening brackets onto a stack and pop when you see a matching closer. Any mismatch or leftover opening bracket means the string is invalid.

Check whether brackets in a string are balanced and properly nested.

#python #stack #strings