def gradingStudents(grades):
    result = []
    for a in grades:
        if a<38:
            result.append(a)
        else:
            z=int(5*round((a/5)+0.5))
            if (z-a)<3:
                result.append(z)
            else:
                result.append(a)
    return result

public static List<Integer> gradingStudents(List<Integer> grades) {
    
    for(int k=0; k<grades.size();k++){
        if(grades.get(k)>37){          
            for(int i=0;i<3;i++){
                if((grades.get(k)+i)%5==0){
                    grades.set(k,grades.get(k)+i );                 
                }         
        }      
    }

    }
    return grades;

vector<int> gradingStudents(vector<int> grades) {
    vector<int> result;
    for(int i = 0; i < grades.size(); i++){
        int mo = grades[i] % 5;
        if(mo < 3 || grades[i] < 38) result.push_back(grades[i]);
        else result.push_back(grades[i] - mo + 5);
    }
    return result;
}

 var result: Array<Int> = Array<Int>(grades.size) { 0 }
    var counter = 0
    for(grade: Int in grades) {
        if (grade < 38) {
            result[counter] = grade
            counter++
        } else {
            if(grade % 10 in (3..4) || grade % 10 in (8..9)) {
                result[counter] = grade - grade % 5 + 5
                counter++
            } else {
                result[counter] = grade
                counter++
            }
        }
    }
    return result

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