Compilare: user.cpp: In function ‘int main()’: user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 3; i <= n2; i++) ^ user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x < a[pn] && pn <= n) ^ user.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pn == n) ^ user.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pn > n) ^ user.cpp:47:25: warning: ‘pn’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (x < a[pn] && pn <= n) ^