what's the meaning of this centence? less longer?less?longer?longer or shorter?
The Yangtze River is no less longer than the Yellow River.
what's the meaning of this centence? less longer?less?longer?longer or shorter?

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why does"less" go with a comparative form?

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The statement itself is not proper English at least.  Since I didn't know the length of either river I went and checked--the Yangtze being 6,300 km and the Yellow being 5,464 km it is a true statement (referring to the ones in China), it just needs to be restructured to be more readily understandable.  I would suggest "The Yangtze River is not in the least shorter than the Yellow River" or, better yet, "The Yangtze River is certainly longer than the Yellow River."

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It is not shorter for sure , it could be the same length or longer ,you can find out from the context of the paragraph .

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