農場有100隻雞圍成一圈，每隻雞把旁邊的雞啄了一下，雞啄左邊右邊是隨機，不被啄的雞的數量的期望是多少？

int main()
{
vector& results;
srand((unsigned)time(NULL));
for (int i = 0; i != 100000; i++)
{
vector& chickens(100, false);
int judge = rand() % 2;
if (judge)
{
chickens[1] = true;
}
else
{
chickens[99] = true;
}
judge = rand() % 2;
if (judge)
{
chickens[0] = true;
}
else
{
chickens[98] = true;
}
for (auto iter = chickens.begin() + 1; iter != chickens.end() - 1; iter++)
{
judge = rand() % 2;

if (judge)
{
*(iter + 1) = true;
}
else
{
*(iter - 1) = true;
}
}
double count = 0;
for (auto iter = chickens.begin(); iter != chickens.end(); iter++)
{
if (!*iter)
{
count++;
}
}
results.push_back(count);
}