Compilare: user.cpp: In function ‘void change(int, int)’: user.cpp:51:20: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] change(lft, lft+rt>>1); ~~~^~~ user.cpp:52:16: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] change((lft+rt>>1)+1, rt); ~~~^~~ user.cpp: In function ‘void mult(std::vector<int>&, std::vector<int>&)’: user.cpp:89:30: warning: narrowing conversion of ‘(& poly1)->std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)i))’ from ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ to ‘ld {aka long double}’ inside { } [-Wnarrowing] a[i] = {poly1[i], 0.0}; ^ user.cpp:90:30: warning: narrowing conversion of ‘(& poly2)->std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)i))’ from ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ to ‘ld {aka long double}’ inside { } [-Wnarrowing] b[i] = {poly2[i], 0.0}; ^