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--- Day 1: The Tyranny of the Rocket Equation ---
- Math calculation
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--- Day 2: 1202 Program Alarm ---
- Array manipulation
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--- Day 3: Crossed Wires ---
- Line intersection
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--- Day 4: Secure Container ---
- Hash table, Array difference
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--- Day 5: Sunny with a Chance of Asteroids ---
- Array manipulation
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--- Day 6: Universal Orbit Map ---
- Hash table
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--- Day 7: Amplification Circuit ---
- Array manipulation, data memorization
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--- Day 8: Space Image Format ---
- Array manipulation
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--- Day 9: Sensor Boost ---
- Array manipulation
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--- Day 10: Monitoring Station ---
- Math calculation, Heap
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--- Day 11: Space Police ---
- Array manipulation
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--- Day 12: The N-Body Problem ---
- Regular expression, LCM (Least Common Multiple) Calculation
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--- Day 13: Care Package ---
- Array manipulation
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--- Day 14: Space Stoichiometry ---
- Math calculation and optimization, Binary Search
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--- Day 15: Oxygen System ---
- Floodfill, BFS, DFS
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--- Day 16: Flawed Frequency Transmission ---
- Array manipulation, Pattern observation