restructure zeta/** to storage/zeta/**

storage/zeta/py/completed/15652.py

@@ -0,0 +1,12 @@
+N, M = map(int, input().split())
+trace = [([i], M, i) for i in range(N, 0, -1)]  # prev, depth, now
+
+while trace:
+    p, d, n = trace.pop()
+    if d == 1:
+        print(" ".join(map(str, p)))
+        continue
+    for i in range(N, n-1, -1):
+        trace.append((p + [i], d-1, i))
+
+# 코드 재사용 팝트래킹