Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:15:32: error: invalid conversion from ‘long unsigned int (*)(const void*, const void*)’ to ‘__compar_fn_t {aka int (*)(const void*, const void*)}’ [-fpermissive] qsort(v,n,sizeof(v[0]),fcmp); ^ In file included from /usr/local/include/c++/4.8.0/cstdlib:72:0, from /usr/local/include/c++/4.8.0/ext/string_conversions.h:41, from /usr/local/include/c++/4.8.0/bits/basic_string.h:2817, from /usr/local/include/c++/4.8.0/string:52, from /usr/local/include/c++/4.8.0/bits/locale_classes.h:40, from /usr/local/include/c++/4.8.0/bits/ios_base.h:41, from /usr/local/include/c++/4.8.0/ios:42, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/include/stdlib.h:756:13: error: initializing argument 4 of ‘void qsort(void*, size_t, size_t, __compar_fn_t)’ [-fpermissive] extern void qsort (void *__base, size_t __nmemb, size_t __size, ^ user.cpp: In function ‘int fcmp(const void*, const void*)’: user.cpp:20:38: error: new declaration ‘int fcmp(const void*, const void*)’ int fcmp(const void* a, const void* b) ^ user.cpp:8:29: error: ambiguates old declaration ‘long unsigned int fcmp(const void*, const void*)’ unsigned long n,i,v[500001],fcmp(const void* ,const void*); ^