Compilare: main.cpp: In function 'int main()': main.cpp:26:36: warning: operation on 't' may be undefined [-Wsequence-point] 26 | for (int i = 1; i < n; i++) r[(t = (t * a + b) % c) & h][0].push_back(t); | ~~~^~~~~~~~~~~~~~~~~~ main.cpp:26:36: warning: operation on 't' may be undefined [-Wsequence-point] main.cpp:9:13: warning: unused variable 'nmax' [-Wunused-variable] 9 | const int nmax = 1e7 + 7; | ^~~~