49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
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import sys
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def main():
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lines = sys.stdin.read().splitlines()
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order_rules = set()
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updates = []
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i = 0
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n = len(lines)
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while i < n and lines[i].strip():
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line = lines[i].strip()
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if '|' in line:
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x, y = line.split('|')
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x = int(x)
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y = int(y)
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order_rules.add((x, y))
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i += 1
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while i < n and not lines[i].strip():
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i += 1
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while i < n:
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line = lines[i].strip()
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if line:
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update = [int(x) for x in line.split(',')]
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updates.append(update)
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i += 1
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middle_pages = []
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for update in updates:
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position = {page: idx for idx, page in enumerate(update)}
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valid = True
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for x, y in order_rules:
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if x in position and y in position:
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if position[x] >= position[y]:
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valid = False
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break
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if valid:
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mid_index = len(update) // 2
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middle_page = update[mid_index]
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middle_pages.append(middle_page)
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total = sum(middle_pages)
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print(total)
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if __name__ == "__main__":
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main()
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