diff --git "a/learntosurf/Backtracking/2025-04-19-[BOJ]-#15649-N\352\263\274M(1).py" "b/learntosurf/Backtracking/2025-04-19-[BOJ]-#15649-N\352\263\274M(1).py"
new file mode 100644
index 0000000..3f4f1ed
--- /dev/null
+++ "b/learntosurf/Backtracking/2025-04-19-[BOJ]-#15649-N\352\263\274M(1).py"
@@ -0,0 +1,18 @@
+N, M = map(int, input().split())
+visited = [False] * (N + 1)  # 1부터 N까지 사용 여부
+result = []
+
+def backtrack():
+    if len(result) == M:
+        print(' '.join(map(str, result)))
+        return
+    
+    for i in range(1, N + 1):
+        if not visited[i]:
+            visited[i] = True
+            result.append(i)
+            backtrack()
+            result.pop()         # 상태 복원
+            visited[i] = False   # 방문 초기화
+
+backtrack()
\ No newline at end of file
diff --git "a/learntosurf/Backtracking/2025-04-19-[BOJ]-#6603-\353\241\234\353\230\220.py" "b/learntosurf/Backtracking/2025-04-19-[BOJ]-#6603-\353\241\234\353\230\220.py"
new file mode 100644
index 0000000..5ab89ac
--- /dev/null
+++ "b/learntosurf/Backtracking/2025-04-19-[BOJ]-#6603-\353\241\234\353\230\220.py"
@@ -0,0 +1,26 @@
+import sys
+
+def backtrack(S, path, start):
+    if len(path) == 6:
+        print(' '.join(map(str, path)))
+        return
+    for i in range(start, len(S)):
+        path.append(S[i])
+        backtrack(S, path, i + 1)
+        path.pop()
+
+lines = sys.stdin.read().splitlines()
+first_case = True
+
+for line in lines:
+    if line == '0':
+        break
+
+    parts = list(map(int, line.strip().split()))
+    S = parts[1:]
+
+    if not first_case:
+        print()
+    first_case = False
+
+    backtrack(S, [], 0)
\ No newline at end of file