Compilare: user.cpp: In function ‘int binar_to_decimal(int, int)’: user.cpp:21:9: warning: unused variable ‘ct’ [-Wunused-variable] int ct=0; ^ user.cpp: In function ‘void backtrack(int, int)’: user.cpp:73:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(binar_position+i==binar_array.size()-1) ^ user.cpp: In function ‘int main()’: user.cpp:105:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^