cpp_kodovi/code1377107.cpp at main · maxencije/cpp_kodovi · GitHub

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#include <iostream>
#include <stack>

using namespace std;

int main()
{

    string s;
    cin >> s;

    stack<char> p;

    unsigned len = s.size();

    for(unsigned i = 0; i < len; i++) {
        if(s[i] == '(' || s[i] == '{' || s[i] == '[')
            p.push(s[i]);

        if(s[i] == ')' && !s.empty()) {
            if(p.top() == '(')
                p.pop();
            else {
                cout << "ne\n";
                return 0;
            }
        }

        if(s[i] == ']' && !s.empty()) {
            if(p.top() == '[')
                p.pop();
            else {
                cout << "ne\n";
                return 0;
            }
        }

        if(s[i] == '}' && !s.empty()) {
            if(p.top() == '{')
                p.pop();
            else {
                cout << "ne\n";
                return 0;
            }
        }
    }

    if(p.empty())
        cout << "da\n";
    else
        cout << "ne\n";

    return 0;
}