Câu 3

#include <iostream>

using namespace std;

int main(){
	int n = 3,
		a=0,
		b=0,
		c=0;
	int array[n]={0};

	cout<<"So luong phan tu mang ( n >= 1 ): ";
	cin>>n;
	if(n <1 ){
		return 0;
	}

	int t;
	for(int i = 0;i<n;i++){
		cout<<"array["<<i<<"]: ";
		cin>>t;
		while(t<1||t>1000){
			cout<<"Nhap lai array["<<i<<"]: ";
			cin>>t;
		}
		array[i]=t;
	}

	a = array[0],
	b=array[1],
	c=array[2];

	for(int i = 3;i<n;i++){
		if (array[i]> a)
				a = array[i];
		if (array[i]> b)
				b = array[i];
		if (array[i]> c)
				c = array[i];

	}

	cout<<a<<" "<<b<<" "<<c;
}