14 lines
258 B
Python
14 lines
258 B
Python
def solve(K, I):
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stack = list()
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for i in I:
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if i:
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stack.append(i)
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else:
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stack.pop()
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return sum(stack)
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if __name__ == '__main__':
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K = int(input())
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print(solve(K, [int(input()) for _ in range(K)]))
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