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The winner of Facebook’s fourth annual Hacker Cup was Gennady Korofkevich of Russia, who took home a $10,000 grand prize, edging second-place Tomek Czajka of the U.S., who finished second, mirroring his finish in the 2012 Hacker Cup, and took home $3,000; and Makoto Soejima of Japan, who finished third and collected $2,000.

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