DataBuffer Fixed Buffer Init

#include <iostream>
using namespace std;

// Write your DataBuffer class here
class DataBuffer {
    private:
        int size;
        int buffer[20];
        int writeIndex;
    public:
        DataBuffer(int s):size(min(20,max(1,s))),buffer{0},writeIndex(0){}
        void push(int v){
            if (writeIndex < size) {
                buffer[writeIndex] = v;
                writeIndex++;
            }
        }
        void print() {
            for (int i=0; i<writeIndex; i++){
                cout<< buffer[i]<< " ";
            }
        }
};
int main() {
    int s, n;
    cin >> s >> n;

    DataBuffer buf(s);

    for (int i = 0; i < n; i++) {
        int x;
        cin >> x;
        buf.push(x);
    }

    buf.print();
    return 0;
}