7 lines
348 B
Python
7 lines
348 B
Python
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from collections import defaultdict
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def cnt_orb(graph, key, acc): return acc + sum([cnt_orb(graph, k, acc+1) for k in graph[key]])
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with open('input') as f: pairs = [l.strip().split(')') for l in f.readlines()]
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parentToChildren = defaultdict(lambda: [])
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for p in pairs: parentToChildren[p[0]].append(p[1])
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print(cnt_orb(parentToChildren, 'COM', 0))
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