Compilare: main.cpp: In function 'int main()': main.cpp:67:24: warning: operation on 'crt' may be undefined [-Wsequence-point] 67 | prefix[++crt] = 1ULL * (prefix[crt - 1] * v) % q; | ^~~~~ main.cpp:88:40: warning: operation on 'cnt' may be undefined [-Wsequence-point] 88 | prefix[++cnt] = 1ULL * (prefix[cnt - 1] * v) % q; | ^~~~~