Compilare: user.cpp: In function ‘void read()’: user.cpp:20:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "statiuni.in" , "r" , stdin ) ; ^ user.cpp:21:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d" , &N , &K ) ; ^ user.cpp:24:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d" , &x , &y ) ; ^ user.cpp:35:18: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] F[i] = q ; ^