Vijos Collection

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💎Aqua

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“Hydro - Next generation high performance online-judge platform - 新一代高效强大的信息学在线测评系统 (a.k.a. vj5)”

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🔮Psychic

★★

“The online judge service with millions of submissions, since 2005.”

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🔮Psychic

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“Judging daemon for programming contests”