| Time Limit: 1000MS | Memory Limit: 10000K | |
| Total Submissions: 109904 | Accepted: 53646 |
Description
How far can you make a stack of cards overhang a table? If you have one card, you can create a maximum overhang of half a card length. (We‘re assuming that the cards must be perpendicular to the table.) With two cards you can make the top card overhang the bottom one by half a card length, and the bottom one overhang the table by a third of a card length, for a total maximum overhang of 1/2 + 1/3 = 5/6 card lengths. In general you can make n cards overhang by 1/2 + 1/3 + 1/4 + ... + 1/(n + 1) card lengths, where the top card overhangs the second by 1/2, the second overhangs tha third by 1/3, the third overhangs the fourth by 1/4, etc., and the bottom card overhangs the table by 1/(n + 1). This is illustrated in the figure below.
Input
Output
Sample Input
1.00 3.71 0.04 5.19 0.00
Sample Output
3 card(s) 61 card(s) 1 card(s) 273 card(s)
Source
1 #include <iostream> 2 using namespace std; 3 4 int main(){ 5 double length; 6 while(cin>>length,length){ 7 if(length == 0.00) break; 8 double num = 1.0; double sum = 0.0; 9 while(1){ 10 sum = sum + 1.0/(num + 1.0); 11 if(sum >= length) break; 12 else 13 num+=1.0; 14 } 15 cout<<(int)num<<" card(s)"<<endl; 16 } 17 return 0; 18 }
原文：http://www.cnblogs.com/grey-qisen/p/4730838.html