Compilare: user.cpp:2:18: warning: extra tokens at end of #include directive [enabled by default] #include <cstdio>> ^ user.cpp: In function ‘int main()’: user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.in","r",stdin); ^ user.cpp:8:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.out","w",stdout); ^ user.cpp:39:15: warning: ‘elem’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<elem; ^