Compilare: user.cpp: In function ‘int main()’: user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ruksak.in", "r", stdin ); ^ user.cpp:16:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ruksak.out", "w", stdout ); ^ user.cpp:20:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%lld%lld",&n,&G ); ^ user.cpp:22:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%lld%lld",&x,&y ); ^ user.cpp:48:30: warning: ‘extra’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf( "%lld",y + extra ); ^