Compilare: user.cpp: In function ‘int main()’: user.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ic.size(); ++i) if(ic[i].id==0) sind=i; ^ user.cpp:68:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ic.size(); ++i) cout<<ic[(i+sind)%ic.size()].id<<' '; ^ user.cpp:46:7: warning: unused variable ‘c’ [-Wunused-variable] int c; ^ user.cpp:42:34: 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:43:36: 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); ^ user.cpp:66:9: warning: ‘sind’ may be used uninitialized in this function [-Wmaybe-uninitialized] int sind; ^