06a.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 int main()
   6 {
   7         char buf[1000];
   8         if (fgets(buf, 1000, stdin) == NULL)
   9                 return 1;
  10         long fish0[9] = {0};
  11         long fish1[9] = {0};
  12         long *this = &fish0[0];
  13         long *that = &fish1[0];
  14
  15         char *p = strtok(buf, ",");
  16         this[atoi(p)]++;
  17         while ((p = strtok(NULL, ",")) != NULL)
  18                 this[atoi(p)]++;
  19
  20         for (long day = 0; day<80; day++) {
  21                 that[8] = this[0];
  22                 for (long i = 0; i<8; i++)
  23                         that[i] = this[i+1];
  24                 that[6] += this[0];
  25                 long *tmp = this;
  26                 this = that;
  27                 that = tmp;
  28         }
  29
  30         long sum = 0;
  31         for (long i = 0; i<=8; i++)
  32                 sum += this[i];
  33         printf("%lu\n", sum);
  34 }