Compilare: user.cpp: In function ‘void aib_update(std::vector<int>&, int, int)’: user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; pos < aib.size(); pos+= lsb(pos)) ^ user.cpp: In function ‘void make_barn(int)’: user.cpp:34:39: warning: capture of variable ‘siz’ with non-automatic storage duration [enabled by default] sort(b[u].rbegin(), b[u].rend(), [siz](int a, int b) { return siz[a] < siz[b]; } ); } ^ user.cpp:10:38: note: ‘int siz [200005]’ declared here int lnk[SPQR], far[SPQR], pos[SPQR], siz[SPQR], pop[SPQR], lvl[SPQR]; ^ user.cpp: In function ‘void make_chns(int)’: user.cpp:45:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < b[u].size(); ++i) { ^