diff --git a/code_study/Baekjoon/python/1516.py b/code_study/Baekjoon/python/1516.py
new file mode 100644
index 0000000..de02586
--- /dev/null
+++ b/code_study/Baekjoon/python/1516.py
@@ -0,0 +1,38 @@
+import sys
+from collections import deque
+input = sys.stdin.readline
+INF = float("inf")
+
+N = int(input())
+
+indegree = [0]*(N+1)
+build_info = [[0] for _ in range(N+1)]
+
+for i in range(1,N+1) :
+    line = list(map(int, input().split()))
+    build_info[i][0] = line[0]
+    for n in line[1:] :
+        if n == -1 :
+            break
+        build_info[n].append(i)
+        indegree[i] += 1
+
+dp = [0]*(N+1)
+qu = deque()
+
+for i in range(1,N+1) :
+    if indegree[i] == 0 :
+        qu.append(i)
+        dp[i] = build_info[i][0]
+
+while qu :
+    now = qu.popleft()
+    
+    for nxt in build_info[now][1:] :
+        indegree[nxt] -= 1
+        dp[nxt] = max(dp[nxt], dp[now] + build_info[nxt][0])
+        
+        if indegree[nxt] == 0 :
+            qu.append(nxt)
+
+print("\n".join(list(map(str, dp[1:]))))
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/9252.py b/code_study/Baekjoon/python/9252.py
new file mode 100644
index 0000000..078104e
--- /dev/null
+++ b/code_study/Baekjoon/python/9252.py
@@ -0,0 +1,27 @@
+s1, s2 = input(), input()
+l1, l2 = len(s1), len(s2)
+dp = [[0]*(l2+1) for _ in range(l1+1)]
+
+for i in range(l1) :
+    for j in range(l2) :
+        if s1[i] == s2[j] :
+            dp[i+1][j+1] = dp[i][j] + 1
+        else :
+            dp[i+1][j+1] = max(dp[i+1][j], dp[i][j+1])
+
+print(dp[l1][l2])
+
+if dp[l1][l2] != 0 :
+    ans = []
+    p1, p2 = l1, l2
+    
+    while p1 > 0 and p2 > 0 :
+        if dp[p1][p2-1] == dp[p1][p2] :
+            p2 -= 1
+        elif dp[p1-1][p2] == dp[p1][p2] :
+            p1 -= 1
+        else :
+            ans.append(s2[p2-1])
+            p1, p2 = p1-1, p2-1
+
+    print("".join(ans[::-1]))