Compilare: user.cpp: In function ‘int main()’: user.cpp:36:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<list.size();j++) ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsir1000.in","r",stdin); ^ user.cpp:16:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsir1000.out","w",stdout); ^