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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 4 / 745 min

Shrink a search interval

State what remains inside your interval and why each update makes progress.

Find the first YES of a question that flips once, whether the candidates are positions or answers.

Test an empty array, one element and a missing target. Explain where the insertion index comes from.

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