Compilare: user.cpp: In function ‘void adauga()’: user.cpp:35:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i< strlen(cuv); i++) ^ user.cpp: In function ‘int sterge_trie(int, trie*)’: user.cpp:50:26: warning: NULL used in arithmetic [-Wpointer-arith] if (cuv[indice+1] != NULL && sterge_trie(indice+1,p->urm[cuv[indice+1] - 'a' ])) ^ user.cpp:62:28: warning: NULL used in arithmetic [-Wpointer-arith] if (cuv[indice + 1] == NULL) ^ user.cpp: In function ‘int apariti()’: user.cpp:82:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < strlen(cuv) ; i++) ^ user.cpp: In function ‘int prefix()’: user.cpp:95:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < strlen(cuv) ; i++) ^