(19) Matching Brackets - C

    I can't get it: when i push test input - it is wrong, when i push it one by one - everything is correct
    Is there something wrong with my output or what?

#include<iostream> #include<vector> using namespace std;

int main(void) { int cases; cin >> cases;

for (int i = 0; i < cases; i++)
{
    vector<char> open;
    vector<char> close;
    char op, cl;
    bool problem = false;
    char line[80];
    cin.getline(line, 80);
    int t = 0;
    for (int i = 0; line[i] != '\0' && !problem; i++)
    {

        char symb = line[i];
        switch (symb)
        {

        case('('): case('['): case('{'): case('<'):
            open.push_back(symb);
            break;

        case(')'): case(']'): case('}'): case('>'):
            close.push_back(symb);
            op = open.back() - t;
            cl = close.front() + t;
            if (open.empty()) problem = true;

            else if ((op == '(') && (cl != ')') || (op == '[') && (cl != ']') ||
                (op == '{' && cl != '}') || (op == '<' && cl != '>')) problem = true;

            else t++;

            break;

        default:
            break;
        }
    }
    cout << !problem << " ";
}
return 0;

}

Thank you for your suggestion. I've added some changes and now it works well (in Ideone, for example) but it doesn't work in CodeAbbey compiler.

    GDB trace:Reading symbols from solution...done.[New LWP 23176]Core was generated by `solution'.
    Program terminated with signal SIGSEGV, Segmentation fault.#0  main () at solution.cc:3737                  
    op = open.back();#0  main () at solution.cc:37

Here is new code

#include <iostream> 
#include <vector>

using namespace std;

int main(void)
{
int cases;
cin >> cases;
cin.clear();
cin.ignore();
for (int i = 0; i < cases; i++)
{
    vector<char> open;
    vector<char> close;
    char op, cl;
    bool correct = true;
    char line[128];
    cin.getline(line, 128);
    int c = 0;

    do
    {
        char symb;
        symb = line[c];
        if (symb == '\0') break;
        c++;

        switch (symb)
        {
        case('('): case('['): case('{'): case('<'):
            open.push_back(symb);
            break;

        case(')'): case(']'): case('}'): case('>'):
            close.push_back(symb);
            op = open.back();
            cl = close.back();
            if (open.empty()) correct = false;
            else if ((op == '(') && (cl != ')') || (op == '[') && (cl != ']') ||
                (op == '{' && cl != '}') || (op == '<' && cl != '>')) correct = false;
            else open.pop_back(), close.pop_back();
            break;

        default:
            break;
        }
    } while (correct);

    if(!open.empty() && close.empty()) correct = false;
    std::cout << correct << " ";
}
return 0;
}

Is it because of cin.funtions?

Oh, finaly solved it. There appear problem in case when "open" vector was empty so i've changed it:

    //OLD
    close.push_back(symb);
        op = open.back();
        cl = close.back();
        if (open.empty()) correct = false;
        else if ((op == '(') && (cl != ')') || (op == '[') && (cl != ']') ||
            (op == '{' && cl != '}') || (op == '<' && cl != '>')) correct = false;
        else open.pop_back(), close.pop_back();
        break;


    //NEW   
    close.push_back(symb);
            if (open.empty()) correct = false;
            else
            {
                op = open.back();
                cl = close.back();
            }

            if ((op == '(') && (cl != ')') || (op == '[') && (cl != ']') ||
                (op == '{' && cl != '}') || (op == '<' && cl != '>')) correct = false;
            else open.pop_back(), close.pop_back();
            break;  

Thank you