stirling模板(n个球,m个盒子)
ll stirling(ll n, ll m) //n个球,m个盒子
{
if (n < m || !n|| !m)return 0;
if (n == m)return 1;
else return stirling(n - 1, m - 1) + stirling(n - 1, m)*m;
}
ll stirling(ll n, ll m) //n个球,m个盒子
{
if (n < m || !n|| !m)return 0;
if (n == m)return 1;
else return stirling(n - 1, m - 1) + stirling(n - 1, m)*m;
}
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