Compilare: user.cpp: In function ‘int main()’: user.cpp:28:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( sp < s.size() ) ^ user.cpp:31:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = log2(b); j>=0 && sp <s.size() ; j--) ^ user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sp >= s.size()) ^ user.cpp:22:16: warning: unused variable ‘bp’ [-Wunused-variable] int sp = 0,bp = 0,tbp = 0; ^