Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:51:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<out[x].size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<res.size();++i) fout<<res[i]<<' '; ^ user.cpp:61:10: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n,m,k,i,x,y; ^ user.cpp: In function ‘unsigned int getInt()’: user.cpp:38:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:42:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^