n = int(input())
a = list(map(int, input().split()))
count = 0
for i in range (1, len(a)-1):
c = a[i] - a[i + 1]
if ( c > 0) :
if((a[i] - a[i-1])>0):
count = count+1
elif( c<0 ):
if((a[i]-a[i-1])<0):
count = count+1
print(count)
CCF 201604-1 折点计数 Python代码
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转载自blog.csdn.net/sinat_27603329/article/details/84870022
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