diff --git a/B.cpp b/B.cpp
new file mode 100644
index 0000000..3eecc64
--- /dev/null
+++ b/B.cpp
@@ -0,0 +1,63 @@
+#include <iostream>
+
+using namespace std;
+int  a[100];
+long long int n,m;
+bool s=false;
+long long int  b[100];
+bool dfs(long long int remain,long long now,int now_layer)
+{
+    if ((now_layer==0)&&(remain==0)) return true;
+    if (now_layer==0) return false;
+    if (remain==0) return false;
+    if (remain>=2*now) return false;
+    if (remain+2*now<=0) return false;
+    long long nextint=now/2;
+    if (remain>0)
+    {
+        remain=remain-now;
+        int xx=now_layer-1;
+        a[xx]=1;//"+"
+        b[xx]=now;
+        return dfs(remain,nextint,now_layer-1);
+    }
+    else
+    {
+        remain=remain+now;
+        int xx=now_layer-1;
+        a[xx]=2;//"-"
+        b[xx]=now;
+        return dfs(remain,nextint,now_layer-1);
+    }
+
+}
+int main()
+{
+    int t;
+    cin>>t;
+    for (int tt=1;tt<=t;tt++)
+    {
+        cin>>n>>m;
+
+        s=false;
+        long long int min_number=1<<(m-1);
+        long long int max_number=(1<<m)-1;
+        for (long long int i=max_number;i>=min_number;i--)
+        {
+            if (dfs(n,i,m))
+            {
+                s=true;
+                break;
+            }
+        }
+        cout<<"Case #"<<tt<<":\n";
+        for (int i=0;i<m;i++)
+        {
+            cout<<b[i]<<" ";
+            if (a[i]==1) cout<<"+\n";
+            if (a[i]==2) cout<<"-\n";
+        }
+
+    }
+    return 0;
+}
diff --git a/L.cpp b/L.cpp
new file mode 100644
index 0000000..da6d2f6
--- /dev/null
+++ b/L.cpp
@@ -0,0 +1,49 @@
+#include <iostream>
+#include <cstdio>
+#include <cstring>
+using namespace std;
+int ans;
+int x,y;
+int gcd(int a,int b)
+{
+    while (b)
+    {
+        int t=b;
+        b=a%b;
+        a=t;
+    }
+    return a;
+}
+
+int main()
+{
+    int t;
+    scanf("%d",&t);
+    for (int tt=0;tt<t;tt++)
+    {
+        ans=1;
+        scanf("%d%d",&x,&y);
+        if (x<y) swap(x,y);
+        bool f=true;
+
+        while (f)
+        {
+            if (x<y) swap(x,y);
+            int now=gcd(x,y);
+            int k2=y/now;
+            int k1=-1;
+            int g=x/now;
+            if (g % (k2+1)==0)
+            {
+                k1=g/(k2+1);
+            }
+            else f=false;
+            if (!f) break;
+            x=now*k1;
+            y=now*k2;
+            ans++;
+        }
+        printf("Case #%d: %d\n",tt+1,ans);
+    }
+    return 0;
+}