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Update insert sort (#2493)

* delete duplicate file
update insert sort

* rename

* fixed error

* using enumerate()
D
Du Yuanchao committed
43f92490fe2edd92d09887eb732eaf6ac5ef698e
Parent: 6a39545
Committed by GitHub <noreply@github.com> on 10/3/2020, 3:19:08 PM