DataBuffer Fixed Buffer Init

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

// Write your DataBuffer class here
class DataBuffer{
    int size;
    int buffer[20];
    int writeIndex;
    public:
    DataBuffer(int s) : writeIndex(0){
        size=s<1 ? 1 : s>20 ? 20 : s;
        memset(buffer,0,20);
    }
    void push(int v){
        if(writeIndex==size) return;
        buffer[writeIndex++]=v;
    }
    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;
}

Solving Approach