虚继承，共同的父类，需要显示调用父类的非默认构造函数？

#include<iostream>
using namespace std;

class Array 
{
public:
    Array()
    {
        len = 0;
        elems = NULL;
    }
    Array(int len_c  , int * elems_c  ){
        len=len_c;
        elems=elems_c;

        cout<<"len in Array is "<< len <<endl;
    }
    ~Array(){
    }
    int length() const;
    int at(int i) const{
        return *(elems + 1);
    }
    int & at(int i){
        return (*(elems + i));
    }
    void print() const{
        for(int i = 0;i < len;i++){
            cout<<at(i)<<" ";
        }
        cout<<endl;
    }
protected:
    int len;
    int * elems;
};

class ChkArray:virtual public Array
{
public:
    ChkArray(int len_c ,int * elems_c ):Array(len_c,elems_c){
    }
    int at(int i) const{
        return *(elems + i);
    }
    int & at(int i){
        return (*(elems + i));
    }
public:
    bool BorderCheck(int i) const{
        if(i >= len){
            cout<<"下标越界";
            cout<<endl;
            return false;
        } else {
            cout<<"下标没有越界";
            cout<<endl;
            return true;
        }
    }
    void print() const{
        for(int i = 0;i < len;i++){
            cout<<at(i)<<" ";
        }
        cout<<endl;
    }
};

class SortArray:virtual public Array
{
public:
    SortArray(int len_c  , int * elems_c  ):Array(len_c,elems_c){
    }
    void sort(bool asc = true){
        //冒泡排序
        for(int i = 0;i < len;i++){
            for(int j = 0;j < len - i - 1;j++){
                if(at(j) > at(j + 1)){
                    int temp;
                    temp = at(j);
                    at(j) = at(j + 1);
                    at(j + 1) = temp;
                }
            }
        }
    }
    void print() const{
        for(int i = 0;i < len;i++){
            cout<<at(i)<<" ";
        }
        cout<<endl;
    }
};

class ChkSrtArray:public ChkArray,public SortArray
{
public:
    ChkSrtArray(int len_c , int * elems_c ):ChkArray(len_c,elems_c),SortArray(len_c,elems_c),Array(len_c,elems_c)
    {
        cout<<"ChkSrtArray construct!"<<endl;
    }
    void print() const{
        for(int i = 0;i < len;i++){
            cout<<at(i)<<" ";
        }
        cout<<endl;
    }
};

int main()
{
    int Arr[] = {9,23,7,5,13,6,8,12,17};


    cout<<"排序前：";
    cout<<endl;
    ChkSrtArray arr(9,Arr);
    arr.print();

    cout<<"排序后：";
    cout<<endl;
    arr.sort();
    arr.print();

    int i;
    cout<<"输入要访问元素的下标：";
    cin>>i;
    if(arr.BorderCheck(i) == true) 
    {
        cout<<arr.at(i);
        cout<<endl;
    }

    return 0;
}