Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; (1<<(i+1)) <= s.size(); i++) ~~~~~~~~~~~^~~~~~~~~~~ main.cpp:48:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); j++) ~~^~~~~~~~~~ main.cpp:50:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((1<<(i+1))+j > s.size()) continue; ~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:75:22: warning: unused variable 'dr' [-Wunused-variable] int bit, st, dr; ^~