c++键盘输入，排序，列表输出

#include <iostream>
using namespace std;
int main()
{
    int n,i,j,t;
    int a[50];
    int cnt = 0;
    cin >> n;
    for(i=0;i<n;i++)
        cin >> a[i];
    //排序
    for (i=0;i<n-1;i++)
    {
        for(j=0;j<n-1-i;j++)
        {
            if(a[j] < a[j+1])
            {
                t= a[j];
                a[j] = a[j+1];
                a[j+1]=t;
            }
        }
    }

    cnt = 1;
    for (i=1;i<n;i++)
    {
        if(a[i] != a[i-1])
        {
            cout << a[i-1] << " " << cnt << endl;
            cnt = 1;
        }
        else
            cnt++;
    }
    cout << a[n-1] <<" " << cnt << endl;
    return 0;
}

#include <iostream>
using namespace std;

int main()
{
    int a[50];
    int n;
    int count = 0;
    while(count<50 && cin>>n)
    {
        a[count++] = n;
    }
    for(int i=0;i<count-1;i++)
        for(int j=0;j<count-i-1;j++)
        {
            if(a[j] < a[j+1])
            {
                int t = a[j];
                a[j] = a[j+1];
                a[j+1] = t;
            }
        }
    cout<<"N\tCount"<<endl;
    int d = a[0];
    int c = 1;
    for(int i=1;i<count;i++)
    {
        if(a[i] == d)
            c++;
        else
        {
            cout<<d<<"\t"<<c<<endl;
            c=1;
            d = a[i];
        }
    }
    cout<<d<<"\t"<<c<<endl;
    return 0;
}