h3. The first idea is that if you have a string of length h, you can insert it in a trie of height h. We could maintain a list of tries,

h3. trie H[N], where H[i] is a trie with height i so when we insert a string with lenght i, we insert it in H[i].

h3. trie H[N], where H[i] is a trie with height i so when we insert a string with lengght i, we insert it in H[i].

h3. But what happens when we have, say 2 strings, one of length 3, and one with length 10^20^? We can't declare H[10^20^].

{
      for(int i=0; i < n; ++i)
      {

            if(T->next[a[i]] == 0)
            //if I don't have an edge, I creat it

            if(T->next[a[i]] == 0) //if I don't have an edge, I create it

            {
                  T->next[a[i]]=new nod;
                  T->next[a[i]]->nr=0;

            {
                  sol[n]=i;

                  if(T->next[i]->nr)//has a number ended?

                  if(T->next[i]->nr)//has a number ended here?

                  {
                        for(int j=1; j <= T->next[i]->nr; ++j)
                        {