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  • HDUOJ--1058HangOver

    HangOver

    Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
    Total Submission(s): 7884    Accepted Submission(s): 3233


    Problem 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.



    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.

    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)
     
    Source
    代码:
     1 #include<stdio.h>
     2 int main()
     3 {
     4     double a,sum;
     5     int i;
     6     while(scanf("%lf",&a),a)
     7     {
     8         sum=0.0;
     9      for(i=2;i<=277;i++)
    10      {
    11          sum+=1.0/i;
    12        if(sum-a>=0) break;
    13      }
    14      printf("%d card(s)
    ",i-1);
    15     }
    16     return 0;
    17 }
    View Code

    数学题...就是搞不清要精确到哪一点..这样的,虽然 及其简单。。。但是往往AC率不高!!

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  • 原文地址:https://www.cnblogs.com/gongxijun/p/3236475.html
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