GzhuOJ_Good Sequence

#include<stdio.h>
int main()
{
    int S[5005],d[5005];
    int n;
    while(~scanf("%d",&n))
    {
        for(int i=0;i<n;++i)
        scanf("%d",&S[i]);
        d[0]=-1;
        d[1]=S[0];
        int len=1,l,r,mid;
        for(int i=1;i<n;++i)
        {
            l=0,r=len;
            while(l<=r)
            {
                mid=(l+r)>>1;
                if(d[mid]<=S[i]) l=mid+1;
                else r=mid-1;
            }
            d[l]=S[i];
            if(l>len) len++;
        }
        printf("%d\n",n-len);
    }
    return 0;
}

附加个题目链接：http://172.22.27.1/problem?pID=1013