Merge sorting (merge sort) embodies the idea of partition, about an array to be sorted into two parts, the two parts merge sort, sort, then sort the two have a good array to merge. This idea can be recursively easy to implement. Merge sort time complexity is O (nlogn), space complexity is O (n).

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.........\.project
.........\.settings\org.eclipse.core.resources.prefs
.........\.settings
.........\bin\algorithms\CreateFile.class
.........\...\..........\ExternalSort.class
.........\...\..........\GetTemp.class
.........\...\..........\Main.class
.........\...\..........\MergeSort.class
.........\...\algorithms
.........\bin
.........\src\algorithms\CreateFile.java
.........\...\..........\ExternalSort.java
.........\...\..........\GetTemp.java
.........\...\..........\Main.java
.........\...\..........\MergeSort.java
.........\...\algorithms
.........\src
.........\test.txt
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