Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void LongPath(int, int, int)’: user.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:60:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:144:17: warning: unused variable ‘d’ [-Wunused-variable] { int i,x,y,cst,d,lca; ^ user.cpp:144:19: warning: unused variable ‘lca’ [-Wunused-variable] { int i,x,y,cst,d,lca; ^