Recently, I was interviewed by a bioinfo company. They gave me a quick test about kmer counting. I came up with a program which takes three parameters, e.g. ./progname fastqfile kmer-length top-count. So it was supposed to produce most top-count number frequented kmer-length kmers from fastqfile. So if you type ./progname sample.fastq 30 25, it should produce top 25 repeated 30-length kmers list in sample.fastq. I thought I was able to it. But I got rejected three times. They said over an email that the results was wrong. I've used KMC2 to test my result. I've produced a text file sorted it out by frequency of 30 kmers and took first 25 lines of the file. The results were the same too. I am very confused. Is there any place online to check that given fastq sample file, it gives results for all specific length kmers displayed ? I can share my results here too.