Hi, Codeforces! I usually create a testset founded on rand (), but the range of this function is 10^5. And if I want to generate a big number, I used to write a function like this
llong randomize (llong x) {
llong res = 1;
for (llong i = 1; i <= 5; ++ i) {
res *= rand () * 1LL;
res %= x;
} return res % x + 1;
}
but there's high probability of returning 1.
If you have an effective method of using rand () function, please, write your way.
P.S. sorry for bad english.