DescriptionGivenn,apositiveinteger,howmanypositiveintegerslessthannarerelativelyprimeton?Twointegersaandbarerelativelyprimeiftherearenointegersx>1,y>0,z>0suchthata=xyandb=xz.InputThereareseveraltestcases.Foreachtestcase,standardinputcontainsalinewithn<=1,000,000,000.Alinecontaining0followsthelastcase.OutputForeachtestcasethereshouldbesinglelineofoutputansweringthequestionposed...
DescriptionTheFareySequenceFnforanyintegernwithn>=2isthesetofirreduciblerationalnumbersa/bwith0<a<b<=nandgcd(a,b)=1arrangedinincreasingorder.ThefirstfewareF2={1/2}F3={1/3,1/2,2/3}F4={1/4,1/3,1/2,2/3,3/4}F5={1/5,1/4,1/3,2/5,1/2,3/5,2/3,3/4,4/5}YoutaskistocalculatethenumberoftermsintheFareysequenceFn.InputThereareseveraltestcases.Eachtestcasehasonlyoneline,whichcontainsap...
DescriptionElinaisreadingabookwrittenbyRujiaLiu,whichintroducesastrangewaytoexpressnon-negativeintegers.Thewayisdescribedasfollowing:Choose k differentpositiveintegers a1, a2, …, ak.Forsomenon-negative m,divideitbyevery ai (1≤ i ≤ k)tofindtheremainder ri.If a1, a2,…, ak areproperlychosen,mcanbedetermined,thenthepairs(ai, ri)canbeusedtoexpress m.“Itiseasytocalculate...
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