Compilare: main.cpp: In function 'int main()': main.cpp:51:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::__cxx11::basic_string<char> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n",out.size()); ^ main.cpp:52:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<out.size();++i) ~^~~~~~~~~~~ main.cpp:39:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dir.in","r",stdin); ^ main.cpp:40:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dir.out","w",stdout); ^ main.cpp:41:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^