dingding2008 @ 2023-05-13 22:07:44
#include <bits/stdc++.h>
using namespace std;
const int N = 5010;
int a[N], b[N];
int len = 1, len2 = 1;
inline void add()
{
}
inline int mul(int x[], int y)
{
for (int i = 1; i <= len; i++)
{
x[i] *= y;
}
for (int i = 1; i < len; i++)
{
x[i+1] += x[i] / 10;
x[i] %= 10;
}
while (x[len] >= 10)
{
x[len+1] += x[len] / 10;
x[len] %= 10;
len++;
}
return len;
}
int main()
{
int n;
scanf("%d", &n);
b[1] = 1;
for (int i = 1; i <= n; i++)
{
mul(b, i);
add();
}
for (int i = len2; i >= 1; i--)
{
printf("%d", a[i]);
}
return 0;
}dalao们，谁能告诉我add函数怎么写啊...
如果帮我AC了，我就可以关注你.
本萌新太垃圾了(我才四年级)
by X_Sbr @ 2023-10-21 12:50:41
@2011Andy 还有另一种易理解的
def jih(a):
si=0
for i in range(1,a+1):
sj=1
for j in range(2,i+1):
sj=sj*j
si+=sj
return(si)
n=int(input())
print(jih(n))by 2011Andy @ 2023-10-22 08:36:45
@X_zhin 666,五月的帖子你还看