Compilare: user.cpp: In function ‘void update(cint)’: user.cpp:86:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; pos <= comp[path].size() ; pos += lsb(pos)) ^ user.cpp: In function ‘int last(cint, int)’: user.cpp:108:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(step = 1 ; step < comp[path].size() ; step <<= 1); ^ user.cpp:112:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( pos + step <= comp[path].size() && AIB[pos + step] <= lim) ^ user.cpp: In function ‘int fst(cint, int)’: user.cpp:122:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(step = 1 ; step < comp[path].size() ; step <<= 1); ^ user.cpp:128:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i + step <= comp[path].size() && AIB[i+step] < lim) ^ user.cpp: In function ‘int query(int, int)’: user.cpp:141:17: warning: unused variable ‘del’ [-Wunused-variable] int del; ^