Compilare: main.cpp: In function 'int cautaPredX(Nod*, int)': main.cpp:243:28: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] if(nod == NULL) return NULL; ^~~~ main.cpp:249:47: warning: NULL used in arithmetic [-Wpointer-arith] if(nod->key <= x && (nod->key > k || k == NULL)) return nod->key; ^~~~ main.cpp: In function 'int cautaSucX(Nod*, int)': main.cpp:258:28: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] if(nod == NULL) return NULL; ^~~~ main.cpp:264:47: warning: NULL used in arithmetic [-Wpointer-arith] if(nod->key >= x && (nod->key < k || k == NULL)) return nod->key; ^~~~ main.cpp: In function 'bool cauta_n(Nod*, int)': main.cpp:144:1: warning: control reaches end of non-void function [-Wreturn-type] } ^