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>>>>>>>>>>>>>>>>>>>>RNG>>>>>>>>>>>>>>>>>>>>>>

Under certain requirements, the standard random function 
rand of C language can no longer meet our production needs. 
More different types of probability and statistics types 
may be used in the project. 

Here, I refer to https://xoshiro.di.unimi.it/ algorithm 
lists commonly used probability distribution functions 
such as uniform distribution, Gaussian distribution, 
Pareto distribution, etc.