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If node has not been touched yet, x=None\n+\t#\tIf node is touched at this level, y=level\n+\t#\tThe mapValues function filters (x,y) to return either None, if \n+\t#\tnode hasn't been touched even after this search level,\n+\t#or the lowest level found thus far\n+\tassert copartitioned(rank_list,new_char_list) #just to be sure\n+\treturn rank_list.leftOuterJoin(new_char_list).mapValues(find_earliest)","path":"HW1/P5/P5_CC.py","position":32,"original_position":32,"commit_id":"9ac8275be06a9cebc16429773101600937613b33","original_commit_id":"9ac8275be06a9cebc16429773101600937613b33","user":{"login":"oyuchoi","id":5461837,"avatar_url":"https://avatars.githubusercontent.com/u/5461837?v=3","gravatar_id":"","url":"https://api.github.com/users/oyuchoi","html_url":"https://github.com/oyuchoi","followers_url":"https://api.github.com/users/oyuchoi/followers","following_url":"https://api.github.com/users/oyuchoi/following{/other_user}","gists_url":"https://api.github.com/users/oyuchoi/gists{/gist_id}","starred_url":"https://api.github.com/users/oyuchoi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/oyuchoi/subscriptions","organizations_url":"https://api.github.com/users/oyuchoi/orgs","repos_url":"https://api.github.com/users/oyuchoi/repos","events_url":"https://api.github.com/users/oyuchoi/events{/privacy}","received_events_url":"https://api.github.com/users/oyuchoi/received_events","type":"User","site_admin":false},"body":"leftOuterJoin 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