Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:63:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i<G[nod].size(); i++){ ^ user.cpp: In function ‘void citeste(int&)’: user.cpp:26:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buffer, 1, Buffer_Size, stdin); ^ user.cpp:34:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buffer, 1, Buffer_Size, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:76:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amici2.in", "r", stdin); ^ user.cpp:77:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buffer, 1, Buffer_Size, stdin); ^ user.cpp:88:17: warning: ‘ind’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS(ind); ^