/******** Name :- Md Firoz Islam ***********
University :- Northern University Bangladesh
********** Dhaka, Bangladesh ***************/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define yes cout<<"YES"<<endl;
#define no cout<<"NO"<<endl;
#define faster ios::sync_with_stdio(false),cin.tie(NULL);

bool isBracketBalanced(const string& s, stack<pair<char, int>>& bracketStack, int lineNumber)
{
    for (int i = 0; i < s.size(); i++)
    {
        char ch = s[i];
        if (ch == '{' || ch == '(' || ch == '[')
        {
            bracketStack.push({ch, lineNumber});
        }
        else if (ch == '}' || ch == ')' || ch == ']')
        {
            if (bracketStack.empty())
            {
                cout << "Syntax Error: Unmatched closing bracket '" << ch << "' at line " << lineNumber << endl;
                return false;
            }
            char top = bracketStack.top().first;
            if ((ch == '}' && top != '{') || (ch == ')' && top != '(') || (ch == ']' && top != '['))
            {
                cout << "Syntax Error: Mismatched brackets at line " << lineNumber << endl;
                return false;
            }
            bracketStack.pop();
        }
    }
    return true;
}

bool isSemicolonMissing(const string& line)
{
    if(line=="int main()")
        return false;
    string s = line;
    s.erase(s.find_last_not_of(" \t\r\n") + 1);
    if (s.empty() || s.back() == ';' || s.back() == '{' || s.back() == '}')
    {
        return false;
    }
    return true;
}

int main()
{
    ifstream file("Firoz.txt");
    if (!file.is_open())
    {
        cout << "Unable to open the file" << endl;
        return 1;
    }

    stack<pair<char, int>> bracketStack;
    vector<pair<string, int>> semicolonErrors;
    string line;
    int lineNumber = 0;

    while (getline(file, line))
    {
        lineNumber++;

        isBracketBalanced(line, bracketStack, lineNumber);

        if (isSemicolonMissing(line))
        {
            semicolonErrors.push_back({line, lineNumber});
        }
    }

    while (!bracketStack.empty())
    {
        auto unmatched = bracketStack.top();
        bracketStack.pop();
        cout << "Syntax Error: Unmatched opening bracket '" << unmatched.first << "' at line " << unmatched.second << endl;
    }

    for (const auto& error : semicolonErrors)
    {
        cout << "Syntax Error: Missing semicolon at line " << error.second << ": " << error.first << endl;
    }

    if (bracketStack.empty() && semicolonErrors.empty())
    {
        cout << "No Syntax Errors found." << endl;
    }

    file.close();
    return 0;
}