Compilare: user.cpp: In function ‘void solvex()’: user.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[Q[i]].size();j++) ^ user.cpp: In function ‘void solvey()’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[Q[i]].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:47:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:48:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:49:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&X,&Y); ^ user.cpp:51:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^