Compilare: user.cpp: In function ‘int pairup(int)’: user.cpp:60:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<G[nod].size(); i++){ ^ user.cpp:68:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<G[nod].size(); i++){ ^ user.cpp: In function ‘void citire()’: user.cpp:38:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.in", "r", stdin); ^ user.cpp:39:41: 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); ^