Compilare: user.cpp: In function ‘void visit(int)’: user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i < G[node].size(); ++i) ^ user.cpp: In function ‘void create_Strongly_Conn_Component(int, int)’: user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i < Gt[node].size(); ++i) { ^ user.cpp: In function ‘void Write()’: user.cpp:60:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j < Sol[i].size(); j++) ^ user.cpp: In function ‘void Read()’: user.cpp:67:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","rt",stdin); ^ user.cpp:68:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","wt",stdout); ^ user.cpp:70:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N, &M); ^ user.cpp:72:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^