P1100 高低位交换

unsigned int n;
string a;

int main()
{
    cin>>n;

    while(n)
    {
        a+='0'+n%2;
        n/=2;
    }

    while(a.size()<32) a+='0';
    reverse(a.begin(),a.end());

    string a1=a.substr(0,16);
    string a2=a.substr(16,16);
    string b=a2+a1;

    unsigned int res=0;
    for(int i=0;i<b.size();i++) res=res*2+b[i]-'0';

    cout<<res<<endl;
    //system("pause");
}

题解区大佬代码，感觉被吊打了

const int N=1e5+10;

unsigned int n;

int main()
{
    cin>>n;
    cout<<(n<<16|n>>16)<<endl;
    //system("pause");
}