1 files changed, 7 insertions, 0 deletions
diff --git a/progs/a550.py b/progs/a550.py
new file mode 100644
index 0000000..222f51e
--- /dev/null
+++ b/progs/a550.py
@@ -0,0 +1,7 @@
+def longest_common_subsequence(X, Y, m, n): 
+    if m == 0 or n == 0: 
+       return 0 
+    elif X[m-1] == Y[n-1]: 
+       return 1 + longest_common_subsequence(X, Y, m-1, n-1) 
+    else: 
+       return max(longest_common_subsequence(X, Y, m, n-1), longest_common_subsequence(X, Y, m-1, n))
+\ No newline at end of file