Compilare: user.cpp: In function ‘int scan(int&)’: user.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:46:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘int scan(int&)’: user.cpp:22:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pz == DIM) fread(buff,1,DIM,stdin),pz = 0; ^ user.cpp:26:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pz == DIM) fread(buff,1,DIM,stdin),pz = 0; ^ user.cpp: In function ‘int main()’: user.cpp:91:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ user.cpp:92:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out","w",stdout); ^