Compilare: user.cpp: In function ‘void Join(Treap*&, Treap*&, Treap*&)’: user.cpp:121:12: warning: unused variable ‘aux1’ [-Wunused-variable] Treap *aux1,*aux2; ^ user.cpp:121:18: warning: unused variable ‘aux2’ [-Wunused-variable] Treap *aux1,*aux2; ^ user.cpp: In function ‘int main()’: user.cpp:137:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in","r",stdin); ^ user.cpp:138:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out","w",stdout); ^ user.cpp:141:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:144:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^