динамический массив

int ** P, n;
    cin >> n;
    P = new int * [n];
    for (int i = 0; i < n; i++)
        P[i] = new int [n];

struct person
{
    .....
};
int main(int argc, char *argv[])
{   
      ......
    
    person P[n];

    int n, *a;
    std::cin >> n;
    a = new int[n];

#include "stdafx.h"
#include <iostream>
#include <string>
#include <windows.h>
 
using namespace std;
struct person
{
    string name1;
    string name2;
    char sex;
    int year;
    float money;
    string adress;
};
int main(int argc, char *argv[])
{   
    float max, min; 
    string max1, min1;
    setlocale (LC_ALL, "Russian");
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    int n, *a;
    cin >> n;
    a = new int[n];
 
    person P[n];

person *p = new person[n];

int n, **a;
    cin >> n;
    a = new int*[n];
    for (int i = 0; i < n; i++)
        a[i] = new int [n];
    person **p = new person[n][n];

int n, **a;
    cin >> n;
    a = new int*[n];
    for (int i = 0; i < n; i++)
                a[i] = new int [n];
    person **p = new person[n][n];

    int n;
    person **a;
    cin >> n;
    a = new person*[n];
    for (int i = 0; i < n; i++)
                a[i] = new person [n];

  int n;
  person *a;
    cin >> n;
    a = new person*[n];

int n; 
    person *P;
    cin >> n;
    P = new person[n];

#include<limits>

int n; cin >> n;
cin.ignore(numeric_limits<streamsize>::max(), '\n');
person *a = new person[n];

int n; cin >> n;
//cin.ignore(numeric_limits<streamsize>::max(), '\n');
person *a = new person[n];

int n; cin >> n;
person *a = new person[n];