RoAlgo PreOJI 2025 (#1377) 16 problems
RoAlgo PreOJI 2025 V (#1378) 2 problems
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RoAlgo PreOJI 2025 VI (#1379) 2 problems
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RoAlgo PreOJI 2025 VII (#1380) 2 problems
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RoAlgo PreOJI 2025 VIII (#1381) 2 problems
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RoAlgo PreOJI 2025 IX (#1382) 3 problems
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RoAlgo PreOJI 2025 X (#1383) 3 problems
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RoAlgo PreOJI 2025 XI-XII (#1384) 3 problems
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