20 lines
413 B
Python
20 lines
413 B
Python
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#!/usr/bin/env python3
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INPUT_FILE = 'input.txt'
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def main():
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left, right = [], []
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contents = open(INPUT_FILE, 'r').readlines()
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for line in contents:
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fields = line.split(' ')
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left.append(int(fields[0]))
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right.append(int(fields[-1]))
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similarity = 0
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for id in left:
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similarity += id * right.count(id)
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print(similarity)
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if __name__ == '__main__':
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main()
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