Compilare: user.cpp: In function ‘int main()’: user.cpp:14:29: warning: ‘ansnk’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans = 1LL * ans * aux % MOD; ~~~~~~~~~~^~~~~ user.cpp:24:27: note: ‘ansnk’ was declared here int n, k, ansn, ansk, ansnk, prod(1); ^~~~~ user.cpp:14:29: warning: ‘ansk’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans = 1LL * ans * aux % MOD; ~~~~~~~~~~^~~~~ user.cpp:24:21: note: ‘ansk’ was declared here int n, k, ansn, ansk, ansnk, prod(1); ^~~~ user.cpp:42:24: warning: ‘ansn’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << 1LL * ansn * logpow(ansk, MOD - 2) % MOD * logpow(ansnk, MOD - 2) % MOD * (logpow(2, k) - 2) % MOD; ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~