Compilare: user.cpp: In function ‘int main()’: user.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<V.size();++i) ^ user.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<V.size();++i){ ^ user.cpp: In function ‘void openIOFiles()’: user.cpp:8:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pizza.in","r",stdin); ^ user.cpp:9:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pizza.out","w",stdout); ^ user.cpp: In function ‘int main()’: user.cpp:15:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:17:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&aux); ^