Compilare: user.cpp: In constructor ‘data::data()’: user.cpp:22:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] nrc=verif=last=0; ^ user.cpp: In function ‘void update2(data*, char*)’: user.cpp:29:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s==NULL) { ^ user.cpp: In function ‘void update1(data*, char*)’: user.cpp:40:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s==NULL || (p->nrc!=i && p!=trie) ) { ^