Random output different between implementations

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There is no required implementation for uniform_int_distribution<>. [rand.dist.general] specifies that:

The algorithms for producing each of the specified distributions are implementation-defined.

All that [rand.dist.uni.int] states is:

A uniform_int_distribution random number distribution produces random integers i, a <= i <= b, distributed
according to the constant discrete probability function
P(i | a, b) = 1/(b − a + 1) .

Each implementation is free to achieve this distribution how it wishes. What you are seeing is apparently three different implementations.

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