Compilare: main.cpp: In function 'int main()': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v.size()-1;++i) ~^~~~~~~~~~~ main.cpp:12:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aria.in","r",stdin); ^ main.cpp:13:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out","w",stdout); ^