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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/header/../experimental/shuffle.html below:

std::experimental::shuffle - cppreference.com

template< class RandomIt >
void shuffle( RandomIt first, RandomIt last );

Reorders the elements in the given range [first, last) such that each possible permutation of those elements has equal probability of appearance, using the per-thread random number engine as the random number generator.

(none)

Linear in the distance between first and last.

#include <experimental/algorithm>
#include <iostream>
#include <string>
 
int main()
{
    std::string sample{"ABCDEF"};
 
    for (int i = 0; i != 4; ++i)
    {
        std::experimental::shuffle(sample.begin(), sample.end());
        std::cout << sample << '\n';
    }
}

Possible output:

DACBFE
CDFBAE
BDCAFE
BAFCED

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