Compilare: In function 'void build_p_array(long long int)', inlined from 'int main()' at main.cpp:37:18: main.cpp:19:24: warning: iteration 500005 invokes undefined behavior [-Waggressive-loop-optimizations] 19 | p[i] = (pw2[m[i]] - 1 + mod) % mod; | ~~~^ main.cpp:18:19: note: within this loop 18 | for(int i=0; i<=n; i++) | ~^~~ In function 'void build_pow_2(long long int)', inlined from 'int main()' at main.cpp:31:16: main.cpp:13:16: warning: iteration 500004 invokes undefined behavior [-Waggressive-loop-optimizations] 13 | pw2[i] = (pw2[i-1] * 2) % mod; | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:12:19: note: within this loop 12 | for(int i=1; i<=n; i++) | ~^~~