Compilare: user.cpp: In function ‘void create_arb(int, int, int)’: user.cpp:61:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i<arb[L].size(); ++i) ^ user.cpp:68:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i<arb[L].size() + arb[R].size(); ++i) ^ user.cpp:81:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<arb[node].size(); ++i) ^ user.cpp: In function ‘void query(int, int, int)’: user.cpp:134:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (mid != arb[node].size() - 1) ^ user.cpp:138:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] (mid == arb[node].size()-1 || val2 <= val)) ^ user.cpp:141:32: warning: ‘val1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(mid > 0 && val1 > val) ^