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- #include <iostream>
- /*
- S aMd
- M aMd | bAc
- A bAc | _
- */
- void a(int k)
- {
- if (k == 0) {
- return;
- }
- std::cout << "b";
- a(k - 2);
- std::cout << "c";
- }
- void m(int k, int n)
- {
- if (k == n) {
- std::cout << "b";
- a(k - 2);
- std::cout << "c";
- } else {
- std::cout << "a";
- m(k - 2, n);
- std::cout << "d";
- }
- }
- void s(int k, int n)
- {
- std::cout << "a";
- m(k - 2, n);
- std::cout << "d";
- }
- void start(int k, int n)
- {
- if (k % 2) {
- return;
- }
- if (k > n) {
- s(k, n);
- std::cout << std::endl;
- start(k, n + 2);
- }
- }
- int main()
- {
- int k;
- std::cin >> k;
- start(k, 2);
- }
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