Compilare: user.cpp: In function ‘int main()’: user.cpp:26:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!s.empty() && s.size()+n-1-i >= m && tr[i] > s.top()) ^ user.cpp:12:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:15:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trompeta.in", "r", stdin); ^ user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trompeta.out", "w", stdout); ^