Compilare: main.cpp: In function 'int main()': main.cpp:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v.size();++i){ ~^~~~~~~~~ main.cpp:19:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("reteta2.in","r",stdin); ^ main.cpp:20:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("reteta2.out","w",stdout); ^