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digestible's Issues

quantile(50) returns 0 with two nonzero items

#include <cstdint>
#include <stdio.h>

using rtt_container = digestible::tdigest<uint64_t, unsigned>;

int main()
{
        rtt_container rtts = rtt_container(16);
        rtts.insert(100);
        rtts.insert(1000);
        rtts.merge();
        printf("size: %zu\n", rtts.size());
        printf("min: %lu\n", rtts.min());
        printf("quantile(49.99): %g\n", rtts.quantile(49.99));
        printf("quantile(50): %g\n", rtts.quantile(50.0));
        printf("max: %lu\n", rtts.max());
        return 0;
}

outputs:

size: 2
min: 100
quantile(49.99): 100
quantile(50): 0
max: 1000

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