Compilare: user.cpp: In function ‘int main()’: user.cpp:56:30: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘std::vector<char>::size_type {aka unsigned int}’ [-Wformat=] printf("%ld\n",Ans.size()); ^ user.cpp:57:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Ans.size();i++) printf("%c",Ans[i]) ; ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tdeque.in","r",stdin); ^ user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tdeque.out","w",stdout); ^