Compilare: user.cpp: In function ‘int main()’: user.cpp:54:43: warning: narrowing conversion of ‘(p.std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >() + 4294967295u)’ from ‘std::vector<int>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] int st{0}, dr = {p.size() - 1}, mij; ^ user.cpp:76:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < p.size(); ++i ) ^ user.cpp:92:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < p.size(); ++j ) ^ user.cpp:54:49: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] int st{0}, dr = {p.size() - 1}, mij; ^