hdu 5360 Hiking

#include<stdio.h>
#include<string.h>
#include<queue>
#include<algorithm>
using namespace std;
const int N=100000+5;

struct node
{
    int st,ed,id;
    friend bool operator < (node n1,node n2)
    {
        return n2.ed<n1.ed;
    }
}p[N];

priority_queue<node>q;
bool cmp(node x,node y)
{
    return x.st<y.st;
}

int main()
{
    int _,n,i,j,cnt,use[N],go[N],f;
    scanf("%d",&_);
    while(_--)
    {
        scanf("%d",&n);
        memset(use,0,sizeof(use));
        f=1;
        for(i=0;i<n;i++) 
            scanf("%d",&p[i].st);
        for(i=0;i<n;i++)
        {
            scanf("%d",&p[i].ed);
            p[i].id=i+1;
        }
        sort(p,p+n,cmp);
        while(!q.empty()) q.pop();

        for(i=0,j=0,cnt=0;i<n;i++)
        {
            while(j<n&&p[j].st==i)
                q.push(p[j++]);
            while(!q.empty()&&q.top().ed<i)
            {
                q.pop();
            }
            if(q.empty()) break;
            go[cnt++]=q.top().id;
            q.pop();
        }

        printf("%d
",cnt);
        for(i=0;i<cnt;i++)
        {
            use[go[i]]=1;
            if(f==1) {printf("%d",go[i]);f=0;}
              else printf(" %d",go[i]);
        }

        for(i=1;i<=n;i++)
        {
          if(use[i]==0)
          {
              if(f==1) {printf("%d",i);f=0;}
              else printf(" %d",i);
          }
        }

        printf("
");
    }
    return 0;
}