Compilare: user.cpp: In function ‘int main()’: user.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz(xx) xx.size() ^ user.cpp:12:41: note: in definition of macro ‘re’ #define re(xx,yy) for (int xx = 0; xx < yy; ++xx) ^ user.cpp:91:16: note: in expansion of macro ‘sz’ re (i, sz(queries[risk_at])) { ^