Compilare: main.cpp: In function 'void dfs(int)': main.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:116:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'int lca(int, int)': main.cpp:91:1: warning: control reaches end of non-void function [-Wreturn-type] } ^