create dev channel

zeta/py/completed/1043.py

@@ -0,0 +1,37 @@
+import sys
+
+input = sys.stdin.readline
+
+
+def solve(N, M, know: set[int], parties):
+    valid_party = [1 for _ in parties]
+
+    flag = True
+
+    while flag:
+        flag = False
+        for i, p in enumerate(parties):
+            cond = [m in know for m in p]
+            if all(cond):
+                valid_party[i] = 0
+            elif any(cond):
+                flag = True
+                valid_party[i] = 0
+                for m in p:
+                    know.add(m)
+
+    return sum(valid_party)
+
+
+if __name__ == "__main__":
+    N, M = map(int, input().split())
+    know = set()
+
+    pre_know = list(map(int, input().split()))
+    L = pre_know[0]
+    for i in pre_know[1:]:
+        know.add(i)
+
+    parties = [list(map(int, input().split()))[1:] for _ in range(M)]
+
+    print(solve(N, M, know, parties))