why golang is even faster than c++ in leetcode

Hi all,
I used c++ and also golang for lc. I always find golang can finish all the test in a much shorter time than c++ with the exactly same algorithm. So far as I know c++ should be still more efficient than golang. Can anyone explain why golang is taking less time than c++ to pass the lc test? anything special optimized in lc backend for golang?

Thanks

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