Compilare: user.cpp: In function ‘int f(int, int)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < comp.size(); ++ i) ^ user.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < comp.size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:42:13: warning: unused variable ‘ans’ [-Wunused-variable] int tc, ans, i, j, bit; ^ user.cpp:42:24: warning: unused variable ‘bit’ [-Wunused-variable] int tc, ans, i, j, bit; ^