Compilare: user.cpp: In function ‘long int dfs(long int)’: user.cpp:142:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<H[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:167:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.in","r",stdin); ^ user.cpp:169:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&t); ^ user.cpp:170:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld",&n,&k); ^ user.cpp:172:96: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf%lf%lf",&v[i].a.x,&v[i].a.y,&v[i].b.x,&v[i].b.y,&v[i].c.x,&v[i].c.y); ^