Eroare de compilare: user.cpp: In constructor ‘nod::nod()’: user.cpp:11:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] i=NULL;nr=0; ^ user.cpp:12:33: error: ‘memset’ was not declared in this scope memset(fiu,0,sizeof(fiu)); ^ user.cpp: In function ‘void ins(nod*, char*)’: user.cpp:18:12: warning: NULL used in arithmetic [-Wpointer-arith] if(*s==NULL) ^ user.cpp: In function ‘int del(nod*, char*)’: user.cpp:32:12: warning: NULL used in arithmetic [-Wpointer-arith] if(*s==NULL) ^ user.cpp: In function ‘int nr(nod*, char*)’: user.cpp:48:13: warning: NULL used in arithmetic [-Wpointer-arith] if(*s==NULL) ^ user.cpp: In function ‘int pre(nod*, char*, int)’: user.cpp:57:15: warning: NULL used in arithmetic [-Wpointer-arith] if( *s == NULL || n->fiu[ *s-'a' ] == 0 ) ^