Compilare: user.cpp: In function ‘int main()’: user.cpp:30:29: warning: unused variable ‘j’ [-Wunused-variable] int st = n + 1, dr = n, j = n - 1; ^ user.cpp:31:9: warning: unused variable ‘x’ [-Wunused-variable] int x = 0; ^ user.cpp:32:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok = 0; ^ user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("roboti3.in", "r", stdin); ^ user.cpp:11:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("roboti3.out", "w", stdout); ^ user.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:13:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:15:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]), ++f[a[i]]; ^