CodeGraderBench/CodeGraderBench huggingface dataset:
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>

main_program{
    int n; cin >> n;
    int s=0;
    bool valid = 1;
    for(int i=0; i<n; i++) {
        char par; cin >> par;
        if(par == '(') s++;
        else if(par == ')') s--;
        if(s < 0) valid = 0;
    }
    if(s!=0) valid = 0;
    cout << (valid ? "VALID" : "INVALID") << " " << s;
}

Grading criterion: Logic to check valid parenthesis
Rating A: correctly implements the logic to determine if the sequence of parentheses is valid. This includes maintaining a counter, ensuring the counter does not go negative. Student's logic could be slightly different, as long as the logic works
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<iostream>
using namespace std;

int main(){
    int N, openCnt, balance, closeCnt;
    bool validity = true;
    cin >> N;
    openCnt = 0;
    closeCnt = 0;
    int unmatchedOpen = 0;
    for(int i = 0; i < N; i++){
        char C;
        cin >> C;
        if(C == '('){
            openCnt++;
            unmatchedOpen++;
        }
        else if(C == ')'){
            closeCnt++;
            if(unmatchedOpen != 0){
                unmatchedOpen--;
            }
        }
        balance = openCnt-closeCnt;
    }
    if(balance != 0){
        cout << "INVALID " << balance;
    }
    else{
        if(unmatchedOpen != 0){
            cout << "INVALID " << balance;
        }
        else{
            cout << "VALID " << balance;
        }
    }



}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
	int n,c=0;
	char s;
	cin>>n;
	bool e=true;
	for(int i=0;i<n;i++){
		cin>>s;
		if(s == '(')
			c++;
		if(s == ')')
			c--;
		if(c<0) e=false;
	}
	if(c !=0) e=false;
	if(e) cout<<"VALID ";
	else cout<<"INVALID ";
	cout<<c;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
	int n;
	int count1=0,count2=0,order=0;
	cin>>n;
	char ch;
	repeat(n)
	{
		cin>>ch;
		if(ch=='(')
			count1++;
		if(ch==')')
			count2++;
		if(count2>count1)
		{
			order++;
		}
	}
	if(order!=0)
		cout<<"INVALID "<<count1-count2;
	else if(count1==count2)
	{
		cout<<"VALID 0";}
	else
		cout<<"INVALID "<<count1-count2;
	return 0;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program
{   
    bool validity= true;
    int n;
    char c;
    int N=0;
    cin>>n;
    repeat(n)
    {
        cin>>c;
        if(c=='(')
        N++;
        else if(c==')'&&N<=0)
        {
            validity = false;
            N--;
        }
        else if(c==')')
        N--;
    }
    if(validity)
    {
        if(N==0)
        cout<<"VALID "<<N;
        else
        cout<<"INVALID "<<N;
    

    }
    else cout<<"INVALID "<<N;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program {
    int n;
    string input;
    cin>>n>>input;
    
    repeat (n) {
        //read char
    if (char==')') {
        int a;
        a++;
    }

    else if (char=='(') {
        int b;
        b++;
    }
}

    int c=b-a;
    if (char1=='(' && a==b) cout<<"VALID "<<c<<endl;
    if (a!=b || char1==')') cout<<"INVALID "<<c<<endl;
    
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program {
    int x;
    cin>>x;
    repeat(n){
    }
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: C
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
#include<cmath>
main_program{  int n; 
    cin>>n; cin>>noskipws;  char c ; 
   
  int i =1 ;int count1=0,count2=0;while(i<=n){ 
        cin>>c; 
        if (c==')'){ count2+=1;}
        else if (c=='('){ count1+=1;} 
        else cout<<""; i++;
    }   
  if (count1!=count2){cout<<"INVALID"<<" "<<abs(count1-count2-1);}  
   else if (count1!=count2){cout<<"INVALID"<<" 0";}




}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program
{
int n,p=0;cin>>n;
repeat(n)
{ char c;
cin>>c;
if(c=='(') p++;
else if (c==')') p--;
}
if(p==0)cout<<"VALID "<<p;
else cout<<"INVALID "<<p;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: C
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
    int n,N;
    int temp=0;
    char c;
    char prevc;
    int openCount=0; // number of (
    int closeCount=0; // number of )
    cin>>n;
    for(int i=1; i<=n; i++){
        cin>>c;
        if(c=='('){
            if(i==n){temp=1;} //cannot end with (
            ++openCount;
        }
        else if(c==')'){
            if(i==1){temp=1;} // cannot start with )
            ++closeCount;
        }
    }
    N = (openCount - closeCount); // difference between number of '(' and ')'
    if(N!=0){
        cout<<"INVALID"<<" "<<N;
    }
    if(N==0){
        if(temp==1){ // cannot start with')' or end with '('
            cout<<"INVALID"<<" "<<N;
        }
        else cout<<"VALID"<<" "<<N;
    }
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
    unsigned int n;
    cin>>n;
    int a = '(' , b = ')' ,p=0,q=0;
    repeat(n){
        char c;
        cin>>c;
         if(a=='c'){p=p+1;}
         if (b=='c'){q=q+1;}

    }
    if ( p==q ){
        cout<<"valid 0"<<endl;
    }
    else {int x;x=p-q;
        cout<<"invalid "<<x<<endl;
    }

}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
        int n;
        cin>>n;
        int a=0;
        int b=0;
                char c;
        for(int i=0;i<n;i++){
                cin>>c;
                if(c=='{'||c=='(') a++;
                if(c=='}'||c==')') b++;
        }
        if(((a-b)==0)&&(c==')'||c=='}')) cout<<"VALID " <<a-b;
        else cout<<"INVALID "<<a-b;}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
int main(){
int n;
char x;
int m=0;
bool z,y;
cin>>n;
cin>>x;
if(x==')'){y=true;m=m-1;}
if(x=='('){z=true;m=m+1;}
if(z)
{
repeat(n-1)
    {
    cin>>x;
    if(x==')'){m=m-1;}
    if(x=='('){m=m+1;}
    }   
}
if(y)
{repeat(n-1)
    {
    cin>>x;
    if(x==')')m=m-1;
    if(x=='(')m=m+1;
    }}
if(y)cout<<"INVALID "<<m;
if((z)&&(m==0))cout<<"VALID "<<m;
if((z)&&(m!=0))cout<<"INVALID "<<m;
    return 0;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program
{
    cin>>noskipws;
    char input;
    cin>>input;
    if(0<input-'0'<9)
    {
        cin<<input;
    }
    else{
    if(input=='(')
    {
        i=i+1;
    }
    else
    {i=i-1;}
    
    }
    cout<<"Valid "<<i;
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: C
Problem: A sequence of characters ‘(‘ and ‘)’ is said to be balanced or valid, if it can be obtained from a valid mathematical expression by erasing all other symbols. For instance, from a mathematical expression like (1+2)*((3+4)*(1+2)) yields a balanced sequence ()(()()). On the other hand, the sequence (() or the sequence )( is not balanced. Write a C++ program to read a sequence of characters consisting of characters ‘(‘ and ‘)’ and identify if it is VALID or INVALID. To check whether a sequence is valid, it is enough to keep track of the count of ‘(‘s and ‘)’s seen at any point in the sequence, when scanning the sequence left to right. You can use a few examples to understand when a sequence becomes invalid. 
Input Format
A non-negative integer n, followed by a sequence of n characters consisting of ‘(’ and ‘)’  

Output Format
VALID N
or
INVALID N 

where N = openCount - closeCount, where openCount is the number of  ‘(’ symbols and  closeCount is the number of  ‘)’ symbols in the sequence.

Student submission:
#include<simplecpp>
main_program{
    cin >> noskipws;
    int n;
    cin >> n;
    int open,close;
    char openclose;
    for(cin >> openclose; openclose=='(' || ')' ;cin >> openclose){
        if (openclose=='('){
            open+=1;
        }
        else if (openclose==')'){
            close+=1;
        }
    }
    if ((open-close)==0){
        cout<<"VALID 0";
    }
    else if ((open-close)!=0){
        int d=open-close;
        cout<<"INVALID"<<d;
    }
}

Grading criterion: Final count
Rating A: correctly computes the count of '(' - ')
Rating B: Some issue
Rating C: Major issue
Rating D: 0
Assigned grade: A