POJ_Hangover
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Hangover
Time Limit: 1000MS Memory Limit: 10000K
Total Submissions: 95164 Accepted: 46128
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
The 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 will contain exactly three digits.
Output
For 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)
翻译:
若将一叠卡片放在一张桌子的边缘,你能放多远?如果你有一张卡片,你最远能达到卡片长度的一半。(我们假定卡片都正放在桌 子上。)如果你有两张卡片,你能使最上的一张卡片覆盖下面那张的1/2,底下的那张可以伸出桌面1/3的长度,即最远能达到 1/2 + 1/3 = 5/6 的卡片长度。一般地,如果你有n张卡片,你可以伸出 1/2 + 1/3 + 1/4 + … + 1/(n + 1) 的卡片长度,也就是最上的一张卡片覆盖第二张1/2,第二张超出第三张1/3,第三张超出第四张1/4,依此类推,最底的一张卡片超出桌面1/(n + 1)。下面有个图形的例子:
现在给定伸出长度C(0.00至5.20之间),输出至少需要多少张卡片。
解决思路
/*输入一个浮点数,记为c,找出累加式1/2 + 1/3 + 1/4 + ... + 1/(n + 1)大于等于c的最小的n,0.01<=c<=5.20,输入0.00代表输入结束。*/#include "stdio.h"void main(){ double c,sum; int n=1; scanf("%lf",&c); while(c!=0){ sum=0; n=1; //printf("Next PUT:%d Card\n",n); while(sum<c){ sum+=(1.0/(++n)); //printf("Next PUT:%d Card\n",n); } printf("%d card(s)\n",n-1); scanf("%lf",&c); }}
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