Compilare: user.cpp: In function ‘int main()’: user.cpp:63:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlog.in","r",stdin); ^ user.cpp:64:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlog.out","w",stdout); ^ user.cpp:66:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &tests); tests; --tests) { ^ user.cpp:68:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &mod, &proot, &x); ^ user.cpp: In function ‘int get_pow(int, int, int)’: user.cpp:41:40: warning: ‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized] int sqrt = get_sqrt(mod); int val, res; ^ user.cpp:10:17: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (1LL * a * b) % mod; ^ user.cpp:41:35: note: ‘val’ was declared here int sqrt = get_sqrt(mod); int val, res; ^