POJ ( acm.pku.edu.cn ) 1006

早年做的

#include<iostream>
using namespace std;
const int rp=23,re=28,ri=33;
int nexttime(int p,int e,int i,int d)
{
 int x=1;
 while(x<=21252)
 {
     if( (x+d-p)%rp || (x+d-e)%re || (x+d-i)%ri ) x++;
     else return x;
 }
 return x;
}
int main()
{
 int p,e,i,d,n=0;
 while(cin>>p>>e>>i>>d)
 {
     n++;
     if(p==-1&&e==-1&&i==-1&&d==-1)break;
     cout<<"Case "<<n<<": the next triple peak occurs in "<<nexttime(p,e,i,d)<<" days."<<endl;
 }
 return 0;
}