Compilare: main.cpp: In function 'long long int get_poz2(long long int, ModInt, ModInt)': main.cpp:81:13: warning: unused variable 'sk2k11' [-Wunused-variable] long long sk2k11 = fast_pow(s, (k2 - k1 - 1).val); ^~~~~~ main.cpp:82:13: warning: unused variable 'fp' [-Wunused-variable] long long fp = (k2.val * fast_pow(s, (k2 - k1 - 1).val) - 1 + MOD); ^~ main.cpp: In function 'int main()': main.cpp:143:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscfft.in", "r", stdin); ^ main.cpp:144:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscfft.out", "w", stdout); ^ main.cpp:148:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ main.cpp:150:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lld", &n, &s); ^ main.cpp:152:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^