Compilare: main.cpp: In member function 'void skiplist::inserare(int)': main.cpp:149:23: warning: comparison of integer expressions of different signedness: 'std::vector<skiplist::node*>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 149 | if (liste.size() < k + 1) | ~~~~~~~~~~~~~^~~~~~~ main.cpp:117:7: warning: unused variable 'level' [-Wunused-variable] 117 | int level = 1; | ^~~~~ main.cpp: In function 'int main()': main.cpp:333:13: warning: unused variable 'y' [-Wunused-variable] 333 | int op, x, y; | ^