单项选择

    

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问题求解

  

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阅读程序

#include<iostream>
using namespace std;
int rSum(int j)
{
    int sum=0;
    while(j!=0)
    {
        sum=sum*10+(j%10);
        j=j/10;
    }
    return sum;
}
int main()
{
    int n,m,i;
    cin>>n>>m;
for(i=n;i<m;i++)
       if(i==rSum(i))
           cout<<i<<' ';
    return 0;
}

输入：90 120

输出：______

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#include<iostream>
#include<string>
using namespace std;

int main()
{
    string s;
    char m1,m2;
    int i;
    getline(cin,s);
    m1=' ';
    m2=' ';
    for(i=0;i<s.length();i++)
    if(s[i]>m1)
        {
            m2=m1;
            m1=s[i];
        }
        else  if(s[i]>m2)
           m2=s[i];
    cout<<int(m1)<<' '<<int(m2)<<endl;
    return 0;
}

输入：Expo 2010 Shanghai China

输出：______________________

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完善程序

#include<iostream>
using namespace std;
int main()
{
    const int SIZE=1000;
    int n,r,p[SIZE],i,j,k,ans;
    bool tmp;
    cin>>n;
    r=1;
    p[1]=2;
    for(i=3;i<=n;i++)
    {
    ①;
        for(j=1;j<=r;j++)
            if(i%②==0)
            {
                tmp=false;
                break;
            }
        if(tmp)
        {
            r++;
            ③;
        }
    }
    ans=0;
    for(i=2;i<=n/2;i++)
    {
        tmp=false;
        for(j=1;j<=r;j++)
            for(k=j;k<=r;k++)
                if(i+i==④)
                {
                    tmp=true;
                    break;
                }
        if(tmp)
             ans++;
    }
    cout<<ans<<endl;
    return 0;
}

      

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#include<iostream>
#include<cstring>
using namespace std;
const int SIZE=100;
const int INFINITY = 10000;
const bool LEFT=true;
const bool RIGHT =false;
const bool LEFT_TO_RIGHT=true;
const bool RIGHT_TO_LEFT=false;
int n,hour[SIZE];
bool pos[SIZE];
int max(int a,int b)
{
    if(a>b)
       return a;
    else
       return b;
}
int go(bool stage)
{
    int i,j,num,tmp,ans;
    if(stage==RIGHT_TO_LEFT)
    {
        num=0;
        ans=0;
        for(i=1;i<=n;i++)
           if(pos[i]==RIGHT)
           {
               num++;
               if( hour[i]>ans)
                   ans=hour[i];
           }
        if( ① )
            return ans;
        ans=INFINITY;
        for(i=1;i<=n-1;i++)
           if(pos[i]==RIGHT)
               for(j=i+1;j<=n;j++)
                  if(pos[j]==RIGHT)
                  {
                      pos[i]=LEFT;
                      pos[j]=LEFT;
                      tmp=max(hour[i],hour[j])+ ②;
                      if(tmp<ans)
                         ans=tmp;
                      pos[i]=RIGHT;
                      pos[j]=RIGHT;
                  }
        return ans;
    }
    if(stage==LEFT_TO_RIGHT)
    {
        ans=INFINITY;
        for(i=1;i<=n;i++)
            if( ③ )
            {
                pos[i]=RIGHT;
                tmp=④;
                if(tmp<ans)
                    ans=tmp;
                ⑤;
            }
        return ans;
    }
    return 0;
}
int main()
{
    int i;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>hour[i];
        pos[i]=RIGHT;
    }
    cout<<go(RIGHT_TO_LEFT)<<endl;
    return 0;
}

              

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