Compilare: user.cpp: In function ‘void solve()’: user.cpp:42:21: warning: unused variable ‘gff’ [-Wunused-variable] int gff = 0; ^ user.cpp:34:15: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int x, y, z, pr, P; ^ user.cpp: In function ‘void read()’: user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("procente.in", "r", stdin); ^ user.cpp:14:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c %d", &sgn, &p); ^ user.cpp: In function ‘void write()’: user.cpp:130:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("procente.out", "w", stdout); ^