1131: 零起点学算法38——求阶乘和
1131: 零起点学算法38——求阶乘和
Time Limit: 1 Sec Memory Limit: 64 MB 64bit IO Format: %lldSubmitted: 2719 Accepted: 1736
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Description
输入一个正整数n(n<=10),计算
S=1!+2!+3!+...+n!
Input
输入一个正整数n(n<=10)(多组数据)
Output
输出S(每组数据一行)
Sample Input
2
Sample Output
3
Source
1 #include<stdio.h> 2 int main(){ 3 int n; 4 while(scanf("%d",&n)!=EOF){ 5 long long s=0; 6 for(int i=1;i<=n;i++){ 7 long long sum=1; 8 for(int j=i;j>0;j--){ 9 sum*=j; 10 } 11 s+=sum; 12 } 13 printf("%lld\n",s); 14 } 15 return 0; 16 }