Compilare: user.cpp: In function ‘int main()’: user.cpp:15:21: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] for ( ; (1<<step+1) <= K+1; step++); ^ user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < M.size(); i++) ^