50 lines
720 B
Python
50 lines
720 B
Python
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from __future__ import annotations
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import sys
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from dataclasses import dataclass
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@dataclass
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class E:
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v: int
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p: E
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n: E
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V0 = None
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p = None
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L = []
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for l in sys.stdin.read().splitlines():
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e = E(int(l),p,None)
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L.append(e)
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if l == "0":
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V0 = e
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if p is not None:
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p.n = e
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p = e
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L[-1].n = L[0]
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L[0].p = L[-1]
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def swap(l,m):
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k = l.p
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n = m.n
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k.n = m
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n.p = l
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l.n = n
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m.p = k
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l.p = m
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m.n = l
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for l in L:
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if l.v > 0:
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for _ in range(l.v):
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swap(l,l.n)
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elif l.v < 0:
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for _ in range(-l.v):
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swap(l.p,l)
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S = 0
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s = V0
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for i in range(3000+1):
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if i in [1000,2000,3000]:
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S += s.v
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s = s.n
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print(S)
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