Compilare: user.cpp: In function ‘void expand(std::vector<int>&)’: user.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1.size();j++) v.push_back(v1[j]); ^ user.cpp:83:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size()-1;i++) sol[find_edge(v[i],v[i+1])]=++nr; ^ user.cpp:87:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q.size();i++) ^ user.cpp:92:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v.size()-1;j++) sol[find_edge(v[j],v[j+1])]=++nr; ^ user.cpp: In function ‘int find_edge(int, int)’: user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nogcd.in", "r", stdin); ^ user.cpp:54:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nogcd.out", "w", stdout); ^ user.cpp:56:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:59:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^