1 #include<cstdio> 2 #include<cstring> 3 #include<algorithm> 4 #include<cmath> 5 using namespace std; 6 long long mp[10]; 7 double ans[10]; 8 void init(){ 9 mp[0] = mp[1] = 1; 10 for(int i = 2; i <= 9; i++){ 11 mp[i] = mp[i-1]*i; 12 } 13 ans[0] = 1.0; 14 ans[1] = 2.0; 15 ans[2] = 2.5; 16 for(int i = 3; i <= 9; i++){ 17 ans[i] = ans[i-1]+1.0/mp[i]; 18 } 19 } 20 int main() 21 { 22 init(); 23 printf("n e - ----------- "); 24 printf("0 1 1 2 2 2.5 "); 25 for(int i = 3; i <= 9; i++){ 26 printf("%d %.9lf ",i,ans[i]); 27 } 28 return 0; 29 }