P1018-P1020

#include<iostream>

#include<cmath>

using namespace std;

int main()

{

    int n;

    cin>>n;

    int sum=0;

    for(int i=2;i<=sqrt(n);i++)

    {

        if(n%i==0)

        {

            sum++;

        }

    }

    if(sum==1)

    {

        cout<<"It's a MaoLaoDa number."<<endl;//注意大小写

    }

    else

    {

        cout<<"It's not a MaoLaoDa number."<<endl;

    }

}

 

 

 

 

#include<iostream>

#include <algorithm>

#include <cmath>

using namespace std;

int n;

int main()

{

    cin>>n;

    for (int i = 1;i <= 50000;i++)

    {

        int a = sqrt(i),tot = 0;

        if (a * a == i)

        {

            tot = 1;

            a--;

        }

        for (int j = 1;j <= a;j++)

        {

            if (i % j == 0) tot += 2;//有一对时加2

        }

        if (tot == n)

        {

            cout<<i<<endl;

            return 0;

        }

     }

   }

 

 

 

#include<iostream>

using namespace std;

int main()

{

    int k;

    cin>>k;

    int judge=0;

    for(int i=10000;i<=30000;i++)

    {

        int a,b,c;

        a=i%1000;    //每三位取模


        b=i/10%1000;

        c=i/100;

        if(a%k==0&&b%k==0&&c%k==0)

        {

            judge++;

            cout<<i<<endl;

        }

    }

    if(judge==0)

    {

        cout<<"No"<<endl;//N

    }

    return 0;

}