Compilare: user.cpp: In function ‘void sort_nodes()’: user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes.size();i++) Poz[nodes[i]]=i+1; ^ user.cpp: In function ‘void make_tree()’: user.cpp:83:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes.size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:99:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1, u=1;i<=Gf[n].size();i++, u^=1) ^