Compilare: user.cpp: In function ‘void visit(int)’: user.cpp:48:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[u].size(); ++i) ^ user.cpp: In function ‘void createComponent(int, int)’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Gt[u].size(); ++i) ^ user.cpp: In function ‘void assignValues(int, bool)’: user.cpp:94:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Comp[Componenta].size();i++){ ^ user.cpp:107:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Comp[Componenta].size();i++) ^ user.cpp: In function ‘void read()’: user.cpp:14:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:19:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp: In function ‘int main()’: user.cpp:114:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.in","rt",stdin); ^ user.cpp:115:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.out","wt",stdout); ^