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Millennium LeetCode Questions 2026

Browse LeetCode problems frequently asked by Millennium. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Broken Calculator	MEDIUM	75%	MathGreedy
Valid Parentheses	EASY	87.5%	StringStack
Best Time to Buy and Sell Stock	EASY	100%	ArrayDynamic Programming
Remove Invalid Parentheses	HARD	75%	StringBacktrackingBreadth-First Search
Count Palindromic Subsequences	HARD	100%	StringDynamic Programming
Word Break	MEDIUM	75%	ArrayHash TableStringDynamic ProgrammingTrieMemoization
Path Sum III	MEDIUM	75%	TreeDepth-First SearchBinary Tree
Collect Coins in a Tree	HARD	87.5%	ArrayTreeGraph TheoryTopological Sort
Validate Binary Search Tree	MEDIUM	75%	TreeDepth-First SearchBinary Search TreeBinary Tree
Merge Intervals	MEDIUM	75%	ArraySorting
Container With Most Water	MEDIUM	75%	ArrayTwo PointersGreedy

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