HDOJ 2034 A-B c++

#include<iostream>using namespace std;int main(){    int nn[100],mm[100],n,m;    while (cin>>n>>m&&(m||n))    {        for (int i = 0; i < n; i++)            cin>>nn[i];        for (int j = 0; j < m; j++)            cin>>mm[j];        for (int j = 0; j < m; j++)            for (int i = 0; i < n; i++)                if(nn[i]==mm[j])                {                    nn[i]=nn[n-1];                    n--;                    break;                }                if(n)                {                    int t;                    for (int j = 0; j < n-1; j++)                    {                        for (int i = 0; i < n-1-j; i++)                        {                            if(nn[i]>nn[i+1])                                {                                t=nn[i+1];                                nn[i+1]=nn[i];                                nn[i]=t;                                }                        }                    }                    for (int i = 0; i < n; i++)                        cout<<nn[i]<<" ";                        cout<<endl;                }                else                {                    cout<<"NULL"<<endl;                }    }    return 0;}