Compilare: main.cpp: In function 'int main()': main.cpp:50:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i=0;i<siruri[index].v.size();i++) | ~^~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/12.2.1/vector:64, from /usr/include/c++/12.2.1/functional:62, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:71, from main.cpp:1: In member function 'constexpr std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>]', inlined from 'int main()' at main.cpp:50:39: /usr/include/c++/12.2.1/bits/stl_vector.h:988:66: warning: 'index' may be used uninitialized [-Wmaybe-uninitialized] 988 | { return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); } | ~~~~~~~~~~~~~~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:20: note: 'index' was declared here 28 | int n,x,lmax=0,index; | ^~~~~