vector<int> gradingStudents(vector<int> grades)
{
    for(int i = 0; i < grades.size(); i++)
    {
        if(grades[i] >= 38)
        {
            int diff = abs((grades[i]%5)-5);
            if(diff < 3)
            {
                grades[i] += diff;
            }
        }
    }
    return grades;
}

function gradingStudents(grades) {
    // less than 38 is automatically failed
    // if the difference b/w original marks and rounded original marks by closest multiple of 5
    // is less than 3, then round off to rounded marks. If not, original marks remain the same.
    let minMarks = 38;
    let lengthOfGrades = grades.length;
    let finalArray = [];
    let mult5 = 0;
    console.log(grades);
    // assuming grades -> [73,67,38,33]
    for(let i = 0; i < lengthOfGrades; i++ ){
        // fail because grades LT 38
        if( grades[i] < minMarks ){
            finalArray.push(grades[i]);
        }else {
            // grades are GTE 38
            // finding the multiples of 5
            mult5 = Math.ceil(grades[i]/5); // 73/5 => 14.6 => ceil(14.6) => 15
            mult5 *= 5; // to get the multiple of 5 closest to grade 15*5=>75
            if( mult5 - grades[i] < 3 ){
                finalArray.push(mult5);
            }else{
                finalArray.push(grades[i]);
            }
        }
    } 
    return finalArray;
}

vector<int> gradingStudents(vector<int> grades) {
    // grades already passed by value
    std::transform(grades.begin(), grades.end(), grades.begin(), 
        [] (int grade) {
            if (grade < 38)
                return grade;
            
            int toNextMultiple = 5 - grade % 5;
            
            if (toNextMultiple < 3) {
                grade += toNextMultiple;
            }
            
            return grade;      
        });
        
    return grades;
}

for(int i=0; i<grades.size(); i++){
 if(grades.get(i)<38) continue;
 else if((5 - grades.get(i)%5) < 3) 
  grades.set(i, grades.get(i)+(5 - grades.get(i)%5));
}
return grades;