Compilare: user.cpp:10:29: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] unsigned int n, mi, ma, v[1 << 20 + 5]; ^ user.cpp: In function ‘long long int nr(unsigned int)’: user.cpp:17:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) { ^ user.cpp:15:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘int main()’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^