Compilare: user.cpp: In function ‘void dfs2(int)’: user.cpp:34:9: warning: unused variable ‘act’ [-Wunused-variable] int act = Tree[nod].cost; ^ user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<C[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:96:40: warning: operation on ‘tmp.edge::n’ may be undefined [-Wsequence-point] a = tmp.n + a - (tmp.n = a); ^