diff --git "a/leetcode3/\354\265\234\353\257\274\354\247\200/851.py" "b/leetcode3/\354\265\234\353\257\274\354\247\200/851.py"
new file mode 100644
index 00000000..e1149ad9
--- /dev/null
+++ "b/leetcode3/\354\265\234\353\257\274\354\247\200/851.py"
@@ -0,0 +1,30 @@
+class Solution:
+    def loudAndRich(self, richer: List[List[int]], quiet: List[int]) -> List[int]:
+        n = len(quiet)
+        adj = [[] for _ in range(n)]
+        
+        # u -> v: u가 v보다 돈이 많음
+        for u, v in richer:
+            adj[v].append(u)
+            
+        res = [-1] * n
+        
+        def dfs(node):
+            if res[node] != -1:
+                return res[node]
+            
+            # 자기 자신이 일단 기본값
+            min_quiet_person = node
+            
+            for parent in adj[node]:
+                candidate = dfs(parent)
+                if quiet[candidate] < quiet[min_quiet_person]:
+                    min_quiet_person = candidate
+                    
+            res[node] = min_quiet_person
+            return res[node]
+
+        for i in range(n):
+            dfs(i)
+            
+        return res
\ No newline at end of file