| 문제 |
풀이
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| 0-9 Day e
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| HR30 Day 0: Hello, World.
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| HR30 Day 1: Data Types
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| HR30 Day 2: Operators
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| HR30 Day 3: Intro to Conditional Statements
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| HR30 Day 4: Class vs. Instance
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| HR30 Day 5: Loops
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| HR30 Day 6: Let's Review
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| HR30 Day 7: Arrays
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| HR30 Day 8: Dictionaries and Maps
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| HR30 Day 9: Recursion
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| 10-19 Day e
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| HR30 Day 10: Binary Numbers |
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| HR30 Day 11: 2D Arrays |
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| HR30 Day 12: Inheritance |
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| HR30 Day 13: Abstract Classes |
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| HR30 Day 14: Scope |
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| HR30 Day 15: Linked List |
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| HR30 Day 16: Exceptions - String to Integer |
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| HR30 Day 17: More Exceptions |
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| HR30 Day 18: Queues and Stacks |
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| HR30 Day 19: Interfaces |
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| 20-29 Day e
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| HR30 Day 20: Sorting |
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| HR30 Day 21: Generics |
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| HR30 Day 22: Binary Search Trees |
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| HR30 Day 23: BST Level-Order Traversal |
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| HR30 Day 24: More Linked Lists |
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| HR30 Day 25: Running Time and Complexity |
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| HR30 Day 26: Nested Logic |
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| HR30 Day 27: Testing |
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| HR30 Day 28: RegEx, Patterns, and Intro to Databases |
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| HR30 Day 29: Bitwise AND |
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