2021-12-01 23:22:53 +00:00
|
|
|
import sys
|
2021-12-02 00:23:47 +00:00
|
|
|
L = [int(l[:-1]) for l in sys.stdin.readlines()]
|
2021-12-02 08:46:21 +00:00
|
|
|
print(sum([0,1][a<d] for (a,d) in zip(L, L[3:])))
|
|
|
|
|
|
|
|
|
|
# window1 = [A,B,C] ; window2 = [B,C,D]
|
|
|
|
|
# sum(Window1) <? sum(window2)
|
|
|
|
|
# (A+B+C) <? (B+C+D)
|
|
|
|
|
# (A+B+C)-B-C <? (B+C+D)-B-C
|
|
|
|
|
# A <? D
|
|
|
|
|
# eg: comparing A+B+C and B+C+D is the same as comparing A and D
|
