01b.c

   1 #include <stdio.h>
   2 #include <stdbool.h>
   3 #include <ctype.h>
   4
   5 bool read_int(int *r)
   6 {
   7         char c;
   8         *r = 0;
   9         while (isdigit(c = getchar()))
  10                 *r = *r*10 + c-'0';
  11         return c != EOF;
  12 }
  13
  14 int one(int winsize)
  15 {
  16         int win[winsize+1], wi = 0, increase = 0;
  17         for (; wi<winsize; wi++)
  18                 read_int(&win[wi]);
  19         while (read_int(&win[wi])) {
  20                 if (win[wi] - win[(wi+winsize+2) % (winsize+1)] > 0)
  21                         increase++;
  22                 wi = (wi+1) % (winsize+1);
  23         }
  24         return increase;
  25 }
  26
  27 int main(void)
  28 {
  29         printf("%d\n", one(3));
  30         return 0;
  31 }