Compilare: user.cpp: In function ‘void read()’: user.cpp:29:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tetris3.in", "r", stdin); ^ user.cpp:30:68: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lld %lld %lld %d %d", &n, &m, &A, &B, &C, &x, &y); ^ user.cpp: In function ‘void write()’: user.cpp:69:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tetris3.out", "w", stdout); ^