given list of grades

This is the code I have made, however, what is being displayed is incorrect. Kindly teach me what do I need to fix.

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

bool check(int passing){
    int g;
    if(g<=passing){
        return false;
    }else{
        return true;
    }
}

int main()
{
    int pg;

    cout<<"What is the passing grade?"<<endl;
    cin>>pg;

    list<int> grades = {100,90,93,95,92,98,97,99,96,94};
    grades.remove_if(check);
    for(int x : grades){
        cout<<x<<'\t';
    }
    return 0;
}

Use a lambda as a predicate for remove_if like below:

#include <iostream>
#include <list>


int main( )
{
    std::cout << "What is the passing grade?\n";
    int passingGrade { };
    std::cin >> passingGrade;

    std::list<int> grades { 100, 90, 93, 95, 92, 49, 50, 98, 97, 99, 11, 94 };

    /*grades.remove_if( [ &passingGrade ]( const int grade ) // lambda approach
                      {
                          return ( grade < passingGrade ) ? true : false;
                      }
                    );*/

    for ( auto it = grades.begin( ); it != grades.end( ); ) // for-loop approach
    {
        if ( *it < passingGrade )
        {
            it = grades.erase( it );
        }
        else
        {
            ++it;
        }
    }

    for ( const int grade : grades )
    {
        std::cout << grade << '\t';
    }
}

Sample I/O

What is the passing grade?
50
100     90      93      95      92      50      98      97      99      94

Another sample:

What is the passing grade?
95
100     95      98      97      99