Compilare: user.cpp:7:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:13:59: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(i = 1; i < N; v[i] = (1LL * v[i++ - 1] * A + B) % C); ^ user.cpp:17:66: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(i = B = 0; i != N; b[v[i++] >> A * 8 & 255].push(v[i])); ^