Compilare: main.cpp: In function 'int main()': main.cpp:78:15: warning: iteration 100009 invokes undefined behavior [-Waggressive-loop-optimizations] fact[i] = (fact[i-1]*i) % mod; ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:76:17: note: within this loop for(int i=1;i<=NMAX;i++) ^ main.cpp: In function 'long long int rezolva(int, int)': main.cpp:54:14: warning: 'rez' may be used uninitialized in this function [-Wmaybe-uninitialized] long long rez , n,k; ^~~