Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:141:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int lca(int, int)’: user.cpp:97:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void raspuns()’: user.cpp:137:37: warning: ‘nod2’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<maxim<<" "<<nod1<<" "<<nod2; ^ user.cpp:137:28: warning: ‘nod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<maxim<<" "<<nod1<<" "<<nod2; ^~~