Lab2 - Pb2

#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>

void Citire(std::vector<char>& sir)
{
    std::ifstream fin("parantezare.in");
    char p;
    while (fin >> p)
    {
        if (p == ' ')
            continue;
        else
            sir.push_back(p);
    }

    fin.close();
}

void Afisare(std::vector<char> sir)
{
    for (auto c : sir)
        std::cout << c;
}

int Ordin(char c)
{
    if (c == '(' or c == ')')
        return 0;
    if (c == '[' or c == ']')
        return 1;

    return 2;
}

bool Parantezare(std::vector<char> paranteze)
{
    std::vector<char> deschise;

    for (auto& crt : paranteze)
    {
        auto urm = *(&crt + 1);
        if (crt == '{' && urm == '}' || crt == '[' && urm == ']')
            return 0;

        if (strchr("([{", crt))
            deschise.push_back(crt);
        else
        {
            if (!deschise.empty())
            {
                for (auto des = deschise.begin(); des != deschise.end() - 1; ++des)
                {
                    if (Ordin(crt) >= Ordin(*des))
                        return 0;
                }

                if (crt == ')' && deschise.back() == '(' || crt == ']' && deschise.back() == '[' || crt == '}' && deschise.back() == '{')
                    deschise.pop_back();
                else
                    return 0;
            }
            else
                return 0;
        }
    }
    return deschise.empty();
}

int main()
{
    std::vector<char> paranteze;
    Citire(paranteze);

    if (!paranteze.empty())
    {
        std::cout << "Sirul ";
        Afisare(paranteze);

        if (Parantezare(paranteze))
            std::cout << " este corect. ";
        else
            std::cout << " nu este corect. ";
    }
    else
        std::cout << "Sirul este vid. ";

    paranteze.clear();
    paranteze.shrink_to_fit();
    return 0;
}