Compilare: main.cpp: In function 'int main()': main.cpp:24:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("spargere.in","r",stdin); ^ main.cpp:25:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("spargere.out","w",stdout); ^ main.cpp:53:26: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<t<<"\n"; ^~~~