HDU 1042大数运算
1 #include<stdio.h>
2 #include<string.h>
3 #define maxn 40005//10000阶乘后的位数大约为40000一开始开得太大结果超时了，最后数组开销了之后便AC
4
5 int main()
6 {
7 int i, j, c, s, n, f[maxn];
8
9 while(scanf("%d",&n)!= EOF)
10 {
11 memset(f,0,sizeof(f));
12 f[0] = 1;
13 for(i=2; i<=n; i++)
14 {
15 c = 0;
16 for(j=0; j<maxn; j++)
17 {
18 s = f[j]*i + c;
19 f[j] = s%10;
20 c = s/10;
21 }
22 }
23 for(j=maxn-1; j>=0; j--)
24 if(f[j]) break;
25 for(i=j; i>=0; i--)
26 printf("%d",f[i]);
27 printf("\n");
28 }
29 return 0;
30 }
31
