Compilare: user.cpp: In function ‘int main()’: user.cpp:54:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] powNi = (1 << ni - 1)%mod;// logpow(2, ni - 1); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("azerah.in", "r", stdin); ^ user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("azerah.out", "w", stdout); ^ user.cpp:27:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:35:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:60:34: warning: ‘powNp’ may be used uninitialized in this function [-Wmaybe-uninitialized] rez = (rez + ((powNp - 1)*(powNi - 1) % mod)) % mod; ^