北大acm 1006 Biorhythms 解题报告

Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 58419 Accepted: 16950

Description

Some people believe that there are three cycles in a person’s life that start the day he or she is born. These three cycles are the physical, emotional, and intellectual cycles, and they have periods of lengths 23, 28, and 33 days, respectively. There is one peak in each period of a cycle. At the peak of a cycle, a person performs at his or her best in the corresponding field (physical, emotional or mental). For example, if it is the mental curve, thought processes will be sharper and concentration will be easier.

Since the three cycles have different periods, the peaks of the three cycles generally occur at different times. We would like to determine when a triple peak occurs (the peaks of all three cycles occur in the same day) for any person. For each cycle, you will be given the number of days from the beginning of the current year at which one of its peaks (not necessarily the first) occurs. You will also be given a date expressed as the number of days from the beginning of the current year. You task is to determine the number of days from the given date to the next triple peak. The given date is not counted. For example, if the given date is 10 and the next triple peak occurs on day 12, the answer is 2, not 3. If a triple peak occurs on the given date, you should give the number of days to the next occurrence of a triple peak.

Input

You will be given a number of cases. The input for each case consists of one line of four integers p, e, i, and d. The values p, e, and i are the number of days from the beginning of the current year at which the physical, emotional, and intellectual cycles peak, respectively. The value d is the given date and may be smaller than any of p, e, or i. All values are non-negative and at most 365, and you may assume that a triple peak will occur within 21252 days of the given date. The end of input is indicated by a line in which p = e = i = d = -1.

Output

For each test case, print the case number followed by a message indicating the number of days to the next triple peak, in the form:

Case 1: the next triple peak occurs in 1234 days.

Use the plural form days even if the answer is 1.

Sample Input

0 0 0 00 0 0 1005 20 34 3254 5 6 7283 102 23 320203 301 203 40-1 -1 -1 -1

Sample Output

Case 1: the next triple peak occurs in 21252 days.
Case 2: the next triple peak occurs in 21152 days.
Case 3: the next triple peak occurs in 19575 days.
Case 4: the next triple peak occurs in 16994 days.
Case 5: the next triple peak occurs in 8910 days.
Case 6: the next triple peak occurs in 10789 days

题目意思是输出三个高峰期同时出现的日期三个生理周期分别是23、28、33；如果无法出现则输出21252用一个循环从i=1到21252；如果出现(j-p)%23==0&&(j-e)%28==0&&(j-i)%33==0的话说明出现了但是需要注意的是当j=p=e=i的时候也会出现符合要求所以要排除

代码如下

#include <iostream>

using namespace std;

int main()
{
  long p,e,i,d,k=1;
  long j;
  freopen("t.txt","rt",stdin);
  while(cin>>p>>e>>i>>d&&(p!=-1)&&(e!=-1)&&(i!=-1)&&(d!=-1))
  {   
    for(j=1;j<=21252;j++)
    {   
       if((j-p)%23==0&&(j-e)%28==0&&(j-i)%33==0)
       {
         if((j-d==0)||(j-p==0&&j-e==0&&j-i==0))
          continue;//排除j=p=e=i的情况
         cout<<"Case "<<k<<": the next triple peak occurs in "<<((j-d)<0?(21252+j-d):(j-d))<<" days."<<endl;
         break;
       }

      if(j==21252)
      {
        cout<<"Case "<<k<<": the next triple peak occurs in "<<21252<<" days."<<endl;
        break;
      }//永远无法出现的情况
    }

    k++;
  }
  return 0;
}