Compilare: user.cpp: In function ‘int main()’: user.cpp:89:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int o=0; o<v.size() && flag; o++) ^ user.cpp:77:10: warning: unused variable ‘fst’ [-Wunused-variable] bool fst = true; ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vila.in", "r", stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vila.out", "w", stdout); ^