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Question related to mission String Conversion

 

Input: ['line1', '1enil']. Tell me please, why answer is 4? I need four-times make delete (ine1, ne1, e1, 1) and four-times make insert( 1e, 1en, 1eni, 1enil). Or not?

Created at: 2016/12/14 13:54; Updated at: 2016/12/19 11:49
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Oleg_Novikov