Longest Decreasing Subsequence

#include<bits/stdc++.h>
using namespace std;

const int inf = 9999;

int n, seq[100], ldsseq[100], I[100], L[100];

int BINARY_SEARCH(int lo, int hi, int itm)
{
    int mid;

    while(lo <= hi)
    {
        mid = (lo + hi) / 2;

        if(I[mid] < itm)
        {
            lo = mid + 1;
        }

        else
        {
            hi = mid - 1;
        }
    }

    return lo;
}

int LIS()
{
    int i, j , len=0 , r , Llen=0;

    for(i=0; i<n; i++)
    {
        r = BINARY_SEARCH(0, len, seq[i]);

        I[r] = seq[i];
        L[Llen++] = r;

        if(len < r)
        {
            len = r;
        }
    }

    //cout << "LDS Length: " << len;
    return len;
}

void find_squence( int mxlen)
{
    int i=0 , j;

    for(j=1; j<n; j++)
    {
        if(L[j] > L[i])
        {
            i = j;
        }
    }

    int top = L[i];

    top--;

    ldsseq[top] = seq[i];

    for(j=i-1; j>=0; j--)
    {
        if(seq[j] < seq[i] and L[j] == L[i]-1)
        {
            i=j;

            top--;

            ldsseq[top] = seq[i];
        }
    }

    cout << "Sequence: ";
    for(i=mxlen-1; i>=0; i--)
    {
        cout << ldsseq[i] << " ";
    }
}

int main()
{
    while(cin >> n)
    {
        int ilen=0;

        I[ilen++] = -inf;

        for(int i=0; i<n; i++)
        {
            cin >> seq[i];

            I[ilen++] = seq[i];
        }

        reverse(seq, seq+n);

        int rlen = LIS();

        find_squence(rlen);

        cout << "LDS Length = " << rlen << "\n";
    }

    return 0;
}