Compilare: user.cpp: In member function ‘void Graph::tS()’: user.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i<to.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:62:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,a,b; ^ user.cpp:62:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,a,b; ^ user.cpp:60:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in","r",stdin); ^ user.cpp:63:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ user.cpp:67:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&a,&b); ^