POJ 1003 hangover

Hangover

Time Limit: 1000MS		Memory Limit: 10000K
Total Submissions: 124770		Accepted: 60881

DescriptionHow 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 thebottom 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.InputThe input consists of one or more test cases, followed by a line containing the number 0.00 that signals the end of the input. Each test case is a single line containing a positive floating-point number c whose value is at least 0.01 and at most 5.20; c willcontain exactly three digits.OutputFor each test case, output the minimum number of cards necessary to achieve an overhang of at least c card lengths. Use the exact output format shown in the examples.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)

//题目的意思就是在一张桌子的边缘放置纸牌，取一张纸牌放在圆纸牌的下面，且当上面的纸牌露出桌子边缘的长度为第一张纸牌的1／2时纸牌不会掉下去。。。依次将第三张纸牌放在第二张纸牌的下面，且第二张纸牌露出桌面的长度为第三张纸牌的1/3时纸牌不会掉下去，第i张纸牌占i+1纸牌的1/(i+1)

#include <iostream>#include <cstdio>u9de6sing namespace std;int main(int argc, const char * argv[]) {// insert code here...//std::cout << "Hello, World!\n";double dis,f,i;while(scanf("%lf",&f)==1&&f!=0.0){int j;dis=0.0;for(i=2,j=0;dis<f;i++,j++)//露出桌边的总长度超过给定的数值时纸牌就会掉下去dis+=1/i;printf("%d card(s)\n",j);}return 0;}