diff --git "a/leetcode3/\353\263\200\354\247\200\355\230\221/v3/3719. Longest Balanced Subarray I.py" "b/leetcode3/\353\263\200\354\247\200\355\230\221/v3/3719. Longest Balanced Subarray I.py"
new file mode 100644
index 00000000..674472be
--- /dev/null
+++ "b/leetcode3/\353\263\200\354\247\200\355\230\221/v3/3719. Longest Balanced Subarray I.py"	
@@ -0,0 +1,34 @@
+'''
+실패
+'''
+class Solution:
+    def longestBalanced(self, nums: List[int]) -> int:
+        st = set()
+        lst = []
+        for num in nums:
+            if num in st:
+                lst.append(0)
+            else:
+                if num % 2 == 0:
+                    lst.append(1)
+                else:
+                    lst.append(-1)
+
+            st.add(num)
+
+        ans = []
+        tmp2 = []
+
+        for i in lst:
+            tmp = []
+            for value, length in ans:
+                tmp.append((value + i, length + 1))
+
+            tmp.append((i, 1))
+            ans = tmp
+            tmp2.extend(ans)
+
+        try:
+            return max([length for value, length in tmp2 if value == 0 and not (value == 0 and length == 1)])
+        except:
+            return 0