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- a=[1,-2,3,-4,5,-6,7,-8,-9]
- for i in range (0,9,2):
- if a[i]>0 and a[i+1]<0:
- print('пока все верно, просмотрено',i,'элементов')
- s=0
- if a[i]<0:
- print ('неправилsssьный элемент',i)
- break
- else:
- if a[i]<0 and a[i+1]>0:
- s=0
- print ('все верно')
- if a[i]>0:
- print ('неправильныaaaaй элемент',i)
- break
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