diff --git "a/leetcode3/\353\263\200\354\247\200\355\230\221/v3/851. Loud and Rich.py" "b/leetcode3/\353\263\200\354\247\200\355\230\221/v3/851. Loud and Rich.py"
new file mode 100644
index 00000000..bef67766
--- /dev/null
+++ "b/leetcode3/\353\263\200\354\247\200\355\230\221/v3/851. Loud and Rich.py"	
@@ -0,0 +1,52 @@
+"""
+[[1,0],[2,1],[3,1],[3,7],[4,3],[5,3],[6,3]]
+
+0 (3) -> 1 (2) -> 2 (5)
+       -> 3 (4) -> 4 (6)
+            -> 5 (1)
+            -> 6 (7)
+1 > 0
+2 > 1
+3 > 1
+3 > 7
+4 > 3
+5 > 3
+6 > 3
+
+bfs로 풀어보려고 했는데 시간초과가 난다.
+"""
+
+from collections import defaultdict, deque
+
+class Solution:
+    def loudAndRich(self, richer: List[List[int]], quiet: List[int]) -> List[int]:
+        dic = defaultdict(list)
+        n = len(quiet)
+        
+        for x,y in richer:
+            dic[y].append(x)
+
+        ans = []
+
+        for i in range(n):
+            quiet_min = 99999
+            quiet_person = -1
+            queue = deque()
+            queue.append(i)
+            
+            while True:
+                if len(queue) == 0:
+                    break
+                
+                element = queue.popleft()
+                if quiet_min > quiet[element]:
+                    quiet_min = quiet[element]
+                    quiet_person = element
+                
+                if element in dic:
+                    for j in dic[element]:
+                        queue.append(j)
+            
+            ans.append(quiet_person)
+        
+        return ans
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