Construct Sensor Packet Placement

#include <iostream>
#include <cstdint>
#include <new>
#include <type_traits>
using namespace std;

typedef struct {
    int id;
    int value;
} SensorPacket;



int main() {
    int index, id, value;
    cin >> index >> id >> value;

    alignas(SensorPacket) uint8_t buffer[(index + 1)*sizeof(SensorPacket)];

    SensorPacket *ptr = new (buffer) SensorPacket;

    ptr->id = id;
    ptr->value = value;

    cout << ptr->id << " " << ptr->value;

    ptr->~SensorPacket();


    return 0;
}

Solving Approach