#pragma once

#include <string>
#include <vector>

using Clause = std::vector<int>;

class CNF {
public:
    long n = 0;
    std::vector<Clause> clauses;

    virtual ~CNF() = default;

    virtual bool write_dimacs(const std::string& filename) const;
    static CNF read_dimacs(const std::string& filename);
};