Compilare: user.cpp: In function ‘void upd(std::vector<int>&, int, int)’: user.cpp:16:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = p; i < bit.size(); i += (i & (-i)) ) ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:73:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < pth.size(); i ++ ) { ^ user.cpp:76:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 1; j < pth[i].size() - 1; j ++ ) { ^