#include <iostream>
#include <math.h>

using namespace std;

void nhap_mang(float a[], int n) {
	for (int i = 0; i < n; i++) {
		cout<<"a["<<i<<"] = "; cin>>a[i];
	}
}

void tim_so_am(float a[], int n) {
	float tong = 0;
	int dem = 0;
	cout<<"Cac so am co tri tuyet doi lon hon 5 la: "<<endl;
	for (int i = 0; i < n; i++) {
		if (a[i] < 0 && fabs(a[i]) > 5) {
			cout<<a[i]<<"\t";
			tong += a[i];
			dem++;
		}
	}
	cout<<"\nTrung binh cong: "<<tong/dem<<endl;
}

void xoa_phan_tu(float a[], int &n, int k) {
	for (int i = k; i < n-1; i++) {
		a[i] = a[i+1];
	}
	n--;
}

void nhap_k(float a[], int n) {
	int k;
	cout<<"Nhap k: "; cin>>k;
	if (k < n && k >= 0) {
		xoa_phan_tu(a, n, k);
		cout<<"Mang sau khi xoa phan tu thu "<<k<<endl;
		for (int i = 0; i < n; i++) cout<<"\t"<<a[i];
	} else {
		cout<<"K = "<<k<<" khong thoa man";
	}
}

int main() {
	int n;
	float a[30];
	do {
		cout<<"Nhap n: "; cin>>n;
		if (n < 1 || n > 30) cout<<"Nhap so nguyen 1 <= n <= 30"<<endl;
	} while (n < 1 || n > 30);
	nhap_mang(a,n);
	tim_so_am(a,n);
	nhap_k(a,n);
	return 0;
}