#include <bits/stdc++.h>

using namespace std;

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

void sapXep(int a[], int n) {
	for (int i = 0; i < n-1; i++) {
		for (int j = i + 1; j < n; j++) {
			if (a[i] > a[j]) {
				int tmp = a[i];
				a[i] = a[j];
				a[j] = tmp;
			}
		}
	}
	cout<<"Mang sau khi sap xep tang dan:"<<endl;
	for (int i = 0; i < n; i++) {
		cout<<"\t"<<a[i];
	}
	cout<<endl;
}

int kiemTraPhanTu(int a[], int n) {
	int count = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] >= 10 && a[i] <= 20) count++;
	}
	return count;
}

bool kiemTraSoChan(int a[], int n) {
	for (int i = 0; i < n - 2; i++) {
		if (a[i] % 2 == 0 && a[i+1] % 2 == 0 && a[i+2] % 2 == 0)
			return true;
	}
	return false;
}

int main() {
	int n, a[100];
	cout<<"Nhap n: "; cin>>n;
	nhapMang(a, n);
	sapXep(a, n);
	cout<<"So phan tu thuoc doan [10, 20] la: "<<kiemTraPhanTu(a, n)<<endl;
	if (kiemTraSoChan(a, n)) {
		cout<<"Mang co ton tai 3 phan tu chan lien tiep"<<endl;
	} else {
		cout<<"Mang khong ton tai 3 phan tu chan lien tiep"<<endl;
	}
	return 0;
}