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class Solution 
{
public:
    stack<char> st;
    bool isValid(string s) 
    {
        if(s[0]==')' || s[0]==']' || s[0]=='}' || s[0]=='>')
        {
            return false;
        }
        else
        {
 
            // int t = st.top();
            for(int i=0;i<s.length();i++)
            {
                if(s[i]=='(' || s[i]=='[' || s[i]=='{' || s[i]=='<')
                {
                    st.push(s[i]);
                }
                else if( (( st.top()=='<') && (s[i]=='>')) || (( st.top()=='[') && (s[i]==']')) || 
                        (( st.top()=='(') && (s[i]==')')) || (( st.top()=='{') && (s[i]=='}')) )
                {
 
                    st.pop();
                }
            }
            if(st.empty()) return true;
            else return false;
        }
 
    }
};

prog.cpp:4:5: error: ‘stack’ does not name a type
     stack<char> st;
     ^~~~~
prog.cpp:5:18: error: ‘string’ has not been declared
     bool isValid(string s)
                  ^~~~~~
prog.cpp: In member function ‘bool Solution::isValid(int)’:
prog.cpp:7:15: error: invalid types ‘int[int]’ for array subscript
         if(s[0]==')' || s[0]==']' || s[0]=='}' || s[0]=='>')
               ^
prog.cpp:7:28: error: invalid types ‘int[int]’ for array subscript
         if(s[0]==')' || s[0]==']' || s[0]=='}' || s[0]=='>')
                            ^
prog.cpp:7:41: error: invalid types ‘int[int]’ for array subscript
         if(s[0]==')' || s[0]==']' || s[0]=='}' || s[0]=='>')
                                         ^
prog.cpp:7:54: error: invalid types ‘int[int]’ for array subscript
         if(s[0]==')' || s[0]==']' || s[0]=='}' || s[0]=='>')
                                                      ^
prog.cpp:15:29: error: request for member ‘length’ in ‘s’, which is of non-class type ‘int’
             for(int i=0;i<s.length();i++)
                             ^~~~~~
prog.cpp:17:23: error: invalid types ‘int[int]’ for array subscript
                 if(s[i]=='(' || s[i]=='[' || s[i]=='{' || s[i]=='<')
                       ^
prog.cpp:17:36: error: invalid types ‘int[int]’ for array subscript
                 if(s[i]=='(' || s[i]=='[' || s[i]=='{' || s[i]=='<')
                                    ^
prog.cpp:17:49: error: invalid types ‘int[int]’ for array subscript
                 if(s[i]=='(' || s[i]=='[' || s[i]=='{' || s[i]=='<')
                                                 ^
prog.cpp:17:62: error: invalid types ‘int[int]’ for array subscript
                 if(s[i]=='(' || s[i]=='[' || s[i]=='{' || s[i]=='<')
                                                              ^
prog.cpp:19:21: error: ‘st’ was not declared in this scope
                     st.push(s[i]);
                     ^~
prog.cpp:19:21: note: suggested alternative: ‘std’
                     st.push(s[i]);
                     ^~
                     std
prog.cpp:19:32: error: invalid types ‘int[int]’ for array subscript
                     st.push(s[i]);
                                ^
prog.cpp:21:29: error: ‘st’ was not declared in this scope
                 else if( (( st.top()=='<') && (s[i]=='>')) || (( st.top()=='[') && (s[i]==']')) ||
                             ^~
prog.cpp:21:29: note: suggested alternative: ‘std’
                 else if( (( st.top()=='<') && (s[i]=='>')) || (( st.top()=='[') && (s[i]==']')) ||
                             ^~
                             std
prog.cpp:21:51: error: invalid types ‘int[int]’ for array subscript
                 else if( (( st.top()=='<') && (s[i]=='>')) || (( st.top()=='[') && (s[i]==']')) ||
                                                   ^
prog.cpp:21:88: error: invalid types ‘int[int]’ for array subscript
                 else if( (( st.top()=='<') && (s[i]=='>')) || (( st.top()=='[') && (s[i]==']')) ||
                                                                                        ^
prog.cpp:22:50: error: invalid types ‘int[int]’ for array subscript
                         (( st.top()=='(') && (s[i]==')')) || (( st.top()=='{') && (s[i]=='}')) )
                                                  ^
prog.cpp:22:87: error: invalid types ‘int[int]’ for array subscript
                         (( st.top()=='(') && (s[i]==')')) || (( st.top()=='{') && (s[i]=='}')) )
                                                                                       ^
prog.cpp:28:16: error: ‘st’ was not declared in this scope
             if(st.empty()) return true;
                ^~
prog.cpp:28:16: note: suggested alternative: ‘std’
             if(st.empty()) return true;
                ^~
                std

Standard output is empty