Compilare: main.cpp: In function 'void update(int, int, int, int, int)': main.cpp:71:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pos; i <= chain[index].size(); i += i & (-i)) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:151:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((1 << (e + 1)) <= chain[i].size()) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~