Compilare: user.cpp: In function ‘int main()’: user.cpp:8:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("subset2.in" , "r" , stdin ); ^ user.cpp:9:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("subset2.out" , "w" , stdout ); ^ user.cpp:12:5: warning: ‘n’ is used uninitialized in this function [-Wuninitialized] if (n==1)printf ("1"); ^ user.cpp:13:5: warning: ‘k’ is used uninitialized in this function [-Wuninitialized] if (k==1)printf ("0"); ^