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tags: - cocubes - coding - language

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Language Quick Reference

Use this as a reminder, not a substitute for writing actual code in your chosen language.

C/C++

• Arrays are fixed-size unless using a dynamic container.
• Use a 64-bit integer type for large sums/products.
• Watch integer division: 5/2 gives 2 for integer operands.
• Strings need careful indexing and null termination in C.
• C++ standard library containers commonly help: vector, string, unordered_map, map, stack, queue, priority_queue.

Java

• Use long for large integer sums/products.
• Arrays have fixed size; ArrayList is dynamic.
• Common structures: HashMap, HashSet, ArrayDeque, PriorityQueue.
• String is immutable; use StringBuilder for repeated concatenation.
• Use equals for string value comparison, not ==.

Python

• Integers automatically grow, but still reason about complexity.
• Common structures: list, dict, set, deque, heapq.
• String slicing can make copies; avoid unnecessary repeated slicing for large input.
• Read input exactly as expected; strip newlines where needed.

All languages

• Avoid names like x1, temp2 everywhere; use clear names in coding solutions.
• Avoid printing debug statements.
• Do not rely on undefined order from unordered/hash collections unless the problem permits it.
• Test with n=0/1 where valid, repeated values and negatives.

[[05_Coding/Coding_Playbook|Coding playbook]]