Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:277:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:304:39: 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:305:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.out","w",stdout); ^ user.cpp:306:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int p , n , k,c2=0;scanf("%d%d%d",&p,&n,&k);for(register int i=1;i<=n;i++)scanf("%lf%lf%lf%lf%lf%lf",&v[i].p1.x,&v[i].p1.y,&v[i].p2.x,&v[i].p2.y,&v[i].p3.x,&v[i].p3.y); ^ user.cpp:306:172: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int p , n , k,c2=0;scanf("%d%d%d",&p,&n,&k);for(register int i=1;i<=n;i++)scanf("%lf%lf%lf%lf%lf%lf",&v[i].p1.x,&v[i].p1.y,&v[i].p2.x,&v[i].p2.y,&v[i].p3.x,&v[i].p3.y); ^