POJ-1006: biorhythms 详解1: 中国剩余定理

 1 /* -------------------------
 2  * 中国剩余定理 
 3  * -------------------------*/
 4 #include "stdio.h"
 5 
 6 int main(void)
 7 {
 8     int p = 0, e = 0, i = 0, d = 0 ;
 9     int days = 0 ;
10     int count = 0 ;
11 
12     while(1)
13     {
14         scanf("%d %d %d %d", &p, &e, &i, &d) ;
15         if(-1 == d)
16             break ;
17 
18         /* 5544  为28和33的公倍数, 且5544 % 23 = 1 */
19         /* 14421 为23和33的公倍数，且14421 % 28 = 1 */
20         /* 1288  为23和28的公倍数，且1288 % 33 = 1 */
21         /* 21252 = 23 * 28 * 33 */
22         days = (5544 * p + 14421 * e + 1288 * i) % 21252 ;
23         if(days <= d)
24             days += 21252 ;
25 
26         printf("Case %d: the next triple peak occurs in %d days.\r\n", 
27             ++count, days - d) ;    
28     }
29 
30     return 0 ;
31 }