信息学奥赛一本通T1173-阶乘和
摘要：from math import factorial as f
n=int(input())
s=0
for i in range(1,n+1):
s+=f(i)
print(s)p……
信息学奥赛一本通T1173-阶乘和-题解（各语言代码）
摘要：**python**
```python
from itertools import accumulate
print(sum(accumulate(range(1,-~int(input())……
2114——————阶乘和
摘要： n = int(input())
m = 1
s = 0
for i in range(1,n+1):
m = m*i
s =……