Compilare: user.cpp: In function ‘int main()’: user.cpp:65:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ic.size(); ++i) cout<<ic[i].id<<' '; ^ user.cpp:45:7: warning: unused variable ‘c’ [-Wunused-variable] int c; ^ user.cpp:41:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mission.in","r",stdin); ^ user.cpp:42:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mission.out","w",stdout); ^