Compilare: user.cpp: In function ‘void conex()’: user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<G[s].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:60:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<r.size()-1;i++) printf("%i ",r[i]); ^ user.cpp:46:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ciclueuler.in","r",stdin); ^ user.cpp:47:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ciclueuler.out","w",stdout); ^ user.cpp:48:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&n,&m); ^ user.cpp:51:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&x,&y); ^