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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 3 / 745 min

Move two pointers

Explain why each pointer move preserves the candidates you still need.

Prove why moving a pointer cannot discard a valid answer.

Return to yesterday’s map problem. Write the lookup and insertion order from memory before reading your code.

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