Bài 3

#include <iostream>
using namespace std;

int main(){
    int n = 0;
    int *pArray = nullptr;
    int arrResult[3] = {-1, -1, -1};

    cout << "Input n: ";
    cin >> n;

    if(n > 0){
        pArray = new int[n]{};
    }

    for(int i = 0; i<n; i++){
        cin >> pArray[i];
    }


    for(int i = 0; i<n; i++){
        if (pArray[i] > arrResult[0]){
            arrResult[2] = arrResult[1];
            arrResult[1] = arrResult[0];
            arrResult[0] = pArray[i];
        }else if(pArray[i] > arrResult[1]){
            arrResult[2] = arrResult[1];
            arrResult[1] = pArray[i];
            continue;
        }else if(pArray[2] > arrResult[1]){
            arrResult[2] = pArray[i];
            continue;
        }
    }

    if(pArray != nullptr)
    {
        delete[] pArray;

    }

    cout << "#output\n[" ;
    if(arrResult[0] != -1){
        cout<< arrResult[0];
    }
    if(arrResult[1] != -1){
        cout << ", " << arrResult[1];
       }
    if(arrResult[2] != -1){
           cout << ", " << arrResult[2] << "]\n";
    }

    return 0;
}