POJ 百炼 保研机试 1003:Hangover

1003:Hangover

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总时间限制: 

1000ms 

内存限制: 

65536kB

描述

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 ncards 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.

输入

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.

输出

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.

样例输入

1.003.710.045.190.00

样例输出

3 card(s)61 card(s)1 card(s)273 card(s)

#include<stdio.h>int main(){double n;double len[300];len[1]=0.5;for(int i=2;i<300;i++){len[i]=len[i-1]+1.0/(i+1); }while(scanf("%lf",&n)!=EOF&&n!=0){for(int i=1;i<300;i++){if(len[i]>n){printf("%d",i);break;}}printf(" card(s)\n");}}