Compilare: user.cpp: In member function ‘void treap::erase(int, int)’: user.cpp:164:16: warning: unused variable ‘m’ [-Wunused-variable] _node *m = aux.first; ^ user.cpp: In function ‘int main()’: user.cpp:198:12: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int T, x; ^ user.cpp:191:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv8.in", "r", stdin); ^ user.cpp:192:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv8.out", "w", stdout); ^