Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:29:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < arb[nod].size(); ++ i){ ^ user.cpp: In function ‘int main()’: user.cpp:134:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < lca.size(); ++ i){ ^ user.cpp:137:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < poz[lca[i].ff].size(); ++ j) ^