ONI 2019 (#492) 36 problems
ONI 2019 V (#573) 3 problems
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ONI 2019 VI (#572) 3 problems
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ONI 2019 VII (#571) 3 problems
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ONI 2019 VIII (#570) 3 problems
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ONI 2019 IX (#574) 6 problems
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ONI 2019 X (#569) 6 problems
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ONI 2019 XI-XII (#19) 6 problems
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ONI 2019 Baraj Juniori (#478) 3 problems
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ONI 2019 Baraj Seniori (#120) 3 problems
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