Compilare: user.cpp: In function ‘int f(int, int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < comp.size(); ++ i) { ^ user.cpp:30:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(bit = 0; bit < comp.size(); ++ bit) ^ user.cpp: In function ‘int main()’: user.cpp:45:13: warning: unused variable ‘ans’ [-Wunused-variable] int tc, ans, i, j, bit; ^ user.cpp:45:24: warning: unused variable ‘bit’ [-Wunused-variable] int tc, ans, i, j, bit; ^