Compilare: main.cpp: In function 'int main()': main.cpp:24:29: warning: NULL used in arithmetic [-Wpointer-arith] 24 | for (int i = 0; a[i] != NULL; i += 1) { | ^~~~ main.cpp:27:79: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 27 | while (!stiva.empty () && stiva.back () < nr && stiva.size () + n - i > m) | ~~~~~~~~~~~~~~~~~~~~~~^~~