hdu_1012(水题。。。不能再水)

 #include<cstdio>
 #include<cstring>
 #include<algorithm>
 #include<cmath>
 using namespace std;
 long long mp[];
 double ans[];
 void init(){
     mp[] = mp[] = ;
     for(int i = ; i <= ; i++){
         mp[i] = mp[i-]*i;
     }
     ans[] = 1.0;
     ans[] = 2.0;
     ans[] = 2.5;
     for(int i = ; i <= ; i++){
         ans[i] = ans[i-]+1.0/mp[i];
     }
 }
 int main()
 {
     init();
     printf("n e\n- -----------\n");
     printf("0 1\n1 2\n2 2.5\n");
     for(int i = ; i <= ; i++){
         printf("%d %.9lf\n",i,ans[i]);
     }
     return ;
 }