Compilare: In file included from /usr/local/include/c++/4.8.0/cassert:43:0, from user.cpp:2: user.cpp: In function ‘int main()’: user.cpp:92:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(Arb.size() == N - 1); ^ user.cpp:94:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Arb.size() ; ++ i) ^