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Free sample week

Learn five DSA topics through daily lessons and practice, then revisit what you learned in a timed rehearsal.

35 to 45 minutes a day5 topics · 2 practice problems a day

Day 5 / 745 min

Keep the next closer on top

Use a stack when the most recent unfinished item must be handled first.

Choose LIFO or FIFO order on purpose, then use a stack to find each next greater value in one pass.

Explain why ([)] fails even though the bracket counts match. Then trace an empty string and an early closing bracket.

Choose your schedule and daily target in Study Sprints to preview a longer course with practice and review.