diff --git a/.ACM-Templates/LCS.cpp b/.ACM-Templates/LCS.cpp
new file mode 100644
index 0000000..5660cc4
--- /dev/null
+++ b/.ACM-Templates/LCS.cpp
@@ -0,0 +1,30 @@
+/// LCS 最长子序列  
+namespace LCS  
+{  
+const int MAXLEN_A = 500;  
+const int MAXLEN_B = 500;  
+int dp[MAXLEN_A+5][MAXLEN_B+5];  
+int deal(const char* a,const char* b)  
+{  
+    int lena=strlen(a);  
+    int lenb=strlen(b);  
+    for(int i=0;i<lenb;i++)  
+    {  
+        for(int j=0;j<lena;j++)  
+        {  
+            if(i==0) dp[i][j]=0;  
+            else if(b[i]==a[j])  
+            {  
+                if(j!=0) dp[i][j]=dp[i-1][j-1]+1;  
+                else dp[i][j]=1;  
+            }  
+            else  
+            {  
+                if(j!=0) dp[i][j]=max(dp[i-1][j],dp[i][j-1]);  
+                else dp[i][j]=dp[i-1][j];  
+            }  
+        }  
+    }  
+    return dp[lenb-1][lena-1];  
+}  
+}//End of namespace LCS