a

// bai 1
int n, a[100], tong = 0;
cout << "Nhap n: "; cin >> n;
for (int i = 0; i < n; i++) {
  cout << "Nhap a[" << i << "]: "; cin >> a[i];
}
cout << "Ket qua: ";
for (int i = 0; i < n; i++) {
  if (a[i] >= 0 && a[i] <= 10) cout << a[i] << ' ';
  if (a[i] > 10 && a[i] % 2 == 1) tong += a[i];
}
cout << endl;
cout << "Tong le lon hon 10: " << tong << endl;

// bai 2
string s; char c; int dem = 0, vt = -1;
cout << "Nhap s: "; getline(cin, s);
cout << "Nhap c: "; cin >> c;
for (int i = 0; i < s.size(); i++) {
  if (s[i] == c) {
    dem++;
    if (vt == -1) vt = i;
  }
}
cout << "So ky tu c: " << dem << endl;
cout << "Vi tri dau tien xuat hien c: " << vt << endl;