263.UglyNumber 注意：1.小于等于0都不属于丑数　　　2.while循环的判断不是num>=0,而是能被2、3、5整除，即能被整除才去除这些数classSolution{public:boolisUgly(intnum){if(num<=0)returnfalse;while(num...

title:Thesumoftheprimesbelow10is2+3+5+7=17.Findthesumofalltheprimesbelowtwomillion.翻译：10下面的质数的和为2+3+5+7=17。请求出200,0000下面全部质数的和。importmath,timedefisOk(a):foriinr...

A reversibleprime inanynumbersystemisaprimewhose"reverse"inthatnumbersystemisalsoaprime.Forexampleinthedecimalsystem73isareversibleprimebecauseitsreve...

1015ReversiblePrimes（20分）Areversibleprimeinanynumbersystemisaprimewhose"reverse"inthatnumbersystemisalsoaprime.Forexampleinthedecimalsystem73isareversibleprimeb...

TimeLimit:12000/6000MS(Java/Others)    MemoryLimit:65536/65536K(Java/Others)TotalSubmission(s):2625    AcceptedSubmissio...

A reversibleprime inanynumbersystemisaprimewhose"reverse"inthatnumbersystemisalsoaprime.Forexampleinthedecimalsystem73isareversibleprimebecauseitsreve...