HackYeah hackathon held in Warsaw, Poland
Xinhua
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A participant attends the HackYeah hackathon in Warsaw, Poland, on Sept. 14, 2019. HackYeah, a major stationary hackathon in Europe, took place on Sept. 14 and 15. (Photos: Xinhua)

Participants attend the HackYeah hackathon in Warsaw, Poland, on Sept. 14, 2019. HackYeah, a major stationary hackathon in Europe, took place on Sept. 14 and 15.

A participant attends the HackYeah hackathon in Warsaw, Poland, on Sept. 14, 2019. HackYeah, a major stationary hackathon in Europe, took place on Sept. 14 and 15.

Participants attend the HackYeah hackathon in Warsaw, Poland, on Sept. 14, 2019. HackYeah, a major stationary hackathon in Europe, took place on Sept. 14 and 15.

A participant attends the HackYeah hackathon in Warsaw, Poland, on Sept. 14, 2019. HackYeah, a major stationary hackathon in Europe, took place on Sept. 14 and 15.