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cp-libraries | C++ libraries for competitive programming

A collection of utilities to streamline the preparation of competitive programming tasks!

This project takes inspiration from Codeforces' testlib, but is meant to be optimized for use in the Italian Olympiad in Informatics.

Recommended usage

All the classes and functions live in the custom C++ namespace cplib, with each library defining its own sub-namespace — cplib::io, cplib::val, etc.

To avoid incurring in ambiguous references, I suggest a setup such as

// Standard library includes

#include "validation.hpp" // Or some other header

using namespace cplib;

// Further in the code
ASSERT(val::lte(N, 100));

(Notice the absence of using namespace std;)

Feature summary

cp-libraries offers:

  • Generic support for input/output — for validators, generators, checkers, interactors.
  • An exception-based validation framework.
  • TODO: Generator helpers.
  • TODO: A checker framework.
  • TODO: A graph library.
  • TODO: A computational geometry library.

Input/Output

The cplib::io::Reader class:

  • Can toggle strict and non-strict read — the former for input validation, the latter e.g. for reading the contestant output in the checker.
  • Throws scoped exceptions when something goes wrong.
  • Provides template methods to read scalars, strings, arrays and matrices with just a few characters of code.
  • Can read floating point numbers with or without a fixed number of decimals.
  • Integrates some validation checks.
  • Automatically detects integer overflows (it will fail to read $3,000,000,000$ as an int).
  • Implements the input stream operator as an alias for common methods.

The cplib::io::Writer class:

  • Provides template methods to write scalars, strings, arrays and matrices with just a few characters of code.
  • Implements the output stream operator as an alias for common methods.

Read the full documentation here.

Validation

The validation library relies on exceptions to signal failures. A brief list of salient features:

  • Combine validation checks with the ASSERT macro to get comprehensive error messages.
  • Built-in support for enforcing element-wise predicates over iterables.
  • Shortcuts for common checks such as "is this array sorted?".
  • Validation results can be combined through logical operators and evaluated as booleans.

Read the full documentation here.

Documentation

io.hpp

TODO

validation.hpp

TODO