Compilare: user.cpp: In function ‘void solve()’: user.cpp:36:26: warning: variable ‘r’ set but not used [-Wunused-but-set-variable] int i, p = maxD - 1, r; ^ user.cpp: In function ‘void read()’: user.cpp:27:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prod.in", "r", stdin); ^ user.cpp:30:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp: In function ‘void write()’: user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prod.out", "w", stdout); ^