Compilare: main.cpp: In function 'int main()': main.cpp:33:11: warning: passing NULL to non-pointer argument 1 of 'void srand(unsigned int)' [-Wconversion-null] 33 | srand(NULL); | ^~~~ In file included from /usr/include/c++/12.2.1/cstdlib:75, from /usr/include/c++/12.2.1/ext/string_conversions.h:41, from /usr/include/c++/12.2.1/bits/basic_string.h:3960, from /usr/include/c++/12.2.1/string:53, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/fstream:38, from main.cpp:2: /usr/include/stdlib.h:456:33: note: declared here 456 | extern void srand (unsigned int __seed) __THROW; | ~~~~~~~~~~~~~^~~~~~ main.cpp: In function 'int quickselect(int, int, int)': main.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] 30 | } | ^