Compilare: user.cpp: In function ‘int main()’: user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[1].size();i++) H.push(G[1][i],C[1][i]); ^ user.cpp:83:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[p.node].size();i++){ ^ user.cpp:66:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:67:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ user.cpp:68:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&M); ^ user.cpp:71:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^