现在我们来看这样的一个 c 元题目,判断数数输入一个正整数 m, 如果它是数数,则输出 yes, 否则输出 no。 什么是数数呢? 数数就是只能被一和自身整除的正整数。看,这是正整数一不是数数,二是数数例,我们输入一,输出 low, 输入二,输出 yes。 好,现在我们来看程序第八行 判断,如果 m 小于等于一,我们就将标志置为零,也就是说,我们这个标志为零的话,它就是不是数数。因为我们的数数是正整数,所以你小于零的数肯定不是数数。 如果你是一,我们规定一不是数数。接下来我们来看。否则,如果你这个条件不满足,我们来看,否则的话,我们就要便利,我们从二开始便利,一直便利到他的平方根 这个数为值。为什么是平方根呢?这里我们有一个优化的技巧,如果 m 不是数数,那么他必定有一个小于或等于他的因子,这个因子必定是不大于他的平方根的。 如果存在一个大于他平方根的因子,那么必定会有一个小于他平方根的因子。因此,我们只需要检查小于或等于他平 平方根的数是否能整除 m, 而不需要检查大于它平方根的数,从而我们减少了不必要的计算,提高了程序的性能。
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i will ask you one game this does the most famous game in time just listen carefully a's water right here d is the water right c is the empty one is d what is d yes what is d me is the no peas water right here? what another one another one a zion is peace luca see a stroker who's the hey jonas b is luca yeah joker b is lebron huh what was the answer? d is lebron oh yeah d is lebron oh you need question questions? hey i'm smart i mean okay smart okay okay okay it's new york a is new york okay b is la s la c is seattle seattle where is he so it's a place just as what is these i want to say these words i don't know say but d is meat yes yes you i'm sorry i'm so good feeling i give another one easy one a is apple b is a banana a is apple p is banana cheese carrots c is carrots what is what is d? a is apple? b is banana? c carrot is carrots what is these? what is it this is the mud right? here? he is the bread i don't get the game though how is the break? this is the break? how is the break? how is that what's the game? i give you? a p c you tell me the d so anything i say you can say it's right or wrong i give another one okay ace carried b steph curry tree trail d d is steph curry yeah d is steph curry d l is all pointed but you're right d is steph curry all there's no answer there's no there is an answer it's how you answer? it's how you answer all right? say all right you're doing okay? hey, it's china bees cannon sees united states look here? he is japanese right? right? right? huh what that's the answer yeah? why why it's how you say it that's how you say you just said that's how you say it。 他这小孩挺聪明,哈哈哈 no no 他知道肯定知道,哈哈哈对吗? is it right yeah let's play one more okay let's play one more a is the annual russell b it's awesome rich see it's anthony davis what is b go back again okay it doesn't matter a b c b matter d matters what is d d is basketball yeah d is bug yep see so basically whatever the category you name no no no oh not that is how you say it。