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How to find the period that most number of calls made where made from a file

 
Greenhorn
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I need to create a java project with the following: I have an input file that holds calls range in milliseconds all over the year – the file is sorted by start time. for example 0-100 (call started at 0 ended at 100) 1-100 , 5-50 , 60-150, 65-180 I need to return the period in the year when the network was the busiest. in this example the result will be 65-100 because in this period there were 4 calls in the air I have limited heap memory ( 8GB ) and must run over the file only once what is the best logic to use here ( in java)
 
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Continue the discussion here: https://coderanch.com/t/705391/languages/find-period-number-calls-file
 
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