给定 $n, k$，计算 $\binom{n}{k} = \frac{n!}{k!(n-k)!} \pmod{2^{32}}$。
输入格式
两个整数 $n, k$ ($1 \le n \le 10^{18}, 0 \le k \le n$)。
输出格式
输出一个整数，表示计算结果。
样例
输入 1
4 2
输出 1
6
输入 2
1000000000 500000000
输出 2
4209467392
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حد الوقت: 1.0 s
حد الذاكرة: 512 MB
مجموع النقاط: 100
#7124. 二项式系数
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