Overlapping Polygons in same feature class using Arcobjects

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I have a polygon feature classs with millions of records, I need to find list of overlapping or intersecting polygons in the same feature class, and how to do it efficiently?

1. I need a ESRI Arcobjects code snippet for the same.
2. I want to know how much percentage overlap is occured.
3. Object ID's of overlapping polygons
4. Attached image and requirement in pictorial view.

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