Compilare: user.cpp: In function ‘void read()’: user.cpp:16:28: warning: format ‘%lld’ expects argument of type ‘long long int*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%lld %d", &n, &m); ^ user.cpp:14:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:15:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desc.in", "r", stdin); ^ user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %d", &n, &m); ^ user.cpp: In function ‘void write()’: user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desc.out", "w", stdout); ^