Compilare: user.cpp: In function ‘int ok(int)’: user.cpp:30:15: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int i, a, b, p, q; ^ user.cpp: In function ‘void read()’: user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triburi.in", "r", stdin); ^ user.cpp:20:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:23:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &h1, &m1, &h2, &m2); ^ user.cpp: In function ‘void write()’: user.cpp:81:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triburi.out", "w", stdout); ^