why did i get compilation error? here is my program:
<#include<iostream>
using namespace std;
#define N 500
int num;
int denote[N],c[N],len[N];
int length;
void quick_sort(int st[N][2],int low,int high,int pi);
void print()
{
    int mem[N][2];
    int k=1;
    for(int i=1;i<=num;i++)
        if(c[i]==1)
        {
            mem[k][0]=len[i];
            mem[k][1]=i;
            k++;
        }
        quick_sort(mem,1,k-1,1);
        if(k==1)
            cout<<1<<endl;
        else
        {
            for(i=1;i<=k-1;i++)
                cout<<mem[i][1]<<' ';
            cout<<endl;
        }
}
void quick_sort(int st[N][2],int low,int high,int pi)
{
    int head=low,tail=high;
    st[0][0]=st[pi][0];
    st[0][1]=st[pi][1];
    if(low>=high)
        ;
    else
    {
        while(low<high)
        {
            while(low<high&&st[high][0]>=st[0][0])  high--;
            st[low][0]=st[high][0];
            st[low][1]=st[high][1];
            while(low<high&&st[low][0]<st[0][0])  low++;
            st[high][0]=st[low][0];
            st[high][1]=st[low][1];
        }
        st[low][0]=st[0][0];
        st[low][1]=st[0][1];
        quick_sort(st,head,low-1,head);
        quick_sort(st,high+1,tail,high+1);
    }
}
int main()
{
    int lp[N][2],rp[N];
    int i,j,k=1;
    cin>>num;
    for(i=1;i<=num;i++)
    {
        cin>>lp[i][0]>>rp[i];
        len[i]=rp[i]-lp[i][0];
        lp[i][1]=i;
    }
    memset(c,0,sizeof(c));
    quick_sort(lp,1,num,1);
    length=1;
    denote[num]=1;
    for(i=num-1;i>0;i--)
    {
        denote[i]=1;
        for(j=i+1;j<=num;j++)
        {
            if(lp[i][0]!=lp[j][0])
                if(rp[lp[i][1]]>rp[lp[j][1]])
                    if(denote[i]<denote[j]+1)
                    {
                        denote[i]=denote[j]+1;
                        if(length<denote[i])
                        {
                            c[lp[i][1]]=1;
                            if(length==1) c[lp[j][1]]=1;
                            length=denote[i];
                        }
                    }
        }
    }
    cout<<length<<endl;
    print();
    return 0;
}



Edited by author 24.04.2007 11:29

First write #include <iostream> instead of <#include <iosteream>
Second declar indentifier i in for(int i=1;i<=num;i++)
{
...
}
instead of
for(i=1;i<=num;i++)
{
...
}

the first you mentioned is my mistaken writing when i am editing.the second is the reason i get CE.thank you so much.

You're welcome :)