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CF1971F
2024-06-03
CF1971F Circle Perimeter
题目Givenaninteger\(r\),findthenumberoflatticepointsthathaveaEuclideandistancefrom\((0,0)\)greaterthanorequalto\(r\)butstrictlylessthan\(r+1\).Alatticepointisapointwithintegercoordinates.TheEuclideandistance