Compilare: user.cpp: In function ‘int main()’: user.cpp:45:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cif.size(); ++ i) { ^ user.cpp:47:8: warning: unused variable ‘ans’ [-Wunused-variable] int ans = 0; ^ user.cpp:49:9: warning: unused variable ‘elim_a’ [-Wunused-variable] bool elim_a = false; ^ user.cpp:50:9: warning: unused variable ‘elim_b’ [-Wunused-variable] bool elim_b = false; ^ user.cpp:18:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gap.in", "r", stdin); ^ user.cpp:19:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gap.out", "w", stdout); ^