diff --git a/HDOJ/3308_libin56842.cpp b/HDOJ/3308_libin56842.cpp
new file mode 100644
index 0000000..68d9c4b
--- /dev/null
+++ b/HDOJ/3308_libin56842.cpp
@@ -0,0 +1,104 @@
+#include <stdio.h>
+#include <string.h>
+#include <algorithm>
+using namespace std;
+
+const int L = 111111;
+int n,m,s[L];
+
+struct node
+{
+    int l,r,c;//左右边界与连续的长度
+    int ln,rn;//左右边界的值
+    int ls,rs,ms,;//左右最大LCIS，和区间最大LCIS
+} a[L<<2];
+
+void pushup(int i)
+{
+    a[i].ls = a[2*i].ls;
+    a[i].rs = a[2*i+1].rs;
+    a[i].ln = a[2*i].ln;
+    a[i].rn = a[2*i+1].rn;
+    a[i].ms = max(a[2*i].ms,a[2*i+1].ms);
+    if(a[2*i].rn<a[2*i+1].ln)//如果左子树的右边界值小于右子树的左边界值，要合并左子树的右边界和右子树的左边界进行计算
+    {
+        if(a[2*i].ls == a[2*i].c)
+            a[i].ls+=a[2*i+1].ls;
+        if(a[2*i+1].rs == a[2*i+1].c)
+            a[i].rs+=a[2*i].rs;
+        a[i].ms = max(a[i].ms,a[2*i].rs+a[2*i+1].ls);
+    }
+}
+
+void init(int l,int r,int i)//建树
+{
+    a[i].l = l;
+    a[i].r = r;
+    a[i].c = r-l+1;
+    if(l == r)
+    {
+        a[i].ln = a[i].rn = s[l];
+        a[i].ls = a[i].rs = a[i].ms = 1;
+        return;
+    }
+    int mid = (a[i].l+a[i].r)>>1;
+    init(l,mid,2*i);
+    init(mid+1,r,2*i+1);
+    pushup(i);
+}
+
+void insert(int i,int t,int m)
+{
+    if(a[i].l == a[i].r)
+    {
+        a[i].ln = a[i].rn = m;
+        return;
+    }
+    int mid = (a[i].l+a[i].r)>>1;
+    if(t<=mid)
+        insert(2*i,t,m);
+    if(t>mid)
+        insert(2*i+1,t,m);
+    pushup(i);
+}
+
+int query(int l,int r,int i)//查询最大的LCIS
+{
+    if(a[i].l>=l && a[i].r<=r)
+    {
+        return a[i].ms;
+    }
+    int mid = (a[i].l+a[i].r)>>1,ans = 0;
+    if(l<=mid)
+        ans = max(ans,query(l,r,2*i));
+    if(r>mid)
+        ans = max(ans,query(l,r,2*i+1));
+    if(a[2*i].rn < a[2*i+1].ln)
+        ans = max(ans , min(mid-l+1,a[2*i].rs)+min(r-mid,a[2*i+1].ls));
+    return ans;
+}
+
+
+int main()
+{
+    int t,i,l,r;
+    char str[5];
+    scanf("%d",&t);
+    while(t--)
+    {
+        scanf("%d%d",&n,&m);
+        for(i = 1; i<=n; i++)
+            scanf("%d",&s[i]);
+        init(1,n,1);
+        while(m--)
+        {
+            scanf("%s%d%d",str,&l,&r);
+            if(str[0] == 'Q')
+                printf("%d\n",query(l+1,r+1,1));
+            else
+                insert(1,l+1,r);
+        }
+    }
+
+    return 0;
+}