CF1166E The LCMs Must be Large

https://www.luogu.com.cn/record/84597793

Luogu/CF1166E/CF1166E.cpp

@@ -0,0 +1,40 @@
+#include <iostream>
+#include <bitset>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e4 + 5;
+
+int m, n;
+std::bitset<N> s[55];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> m >> n;
+
+    for (int i = 1, k; i <= m; i++) {
+        cin >> k;
+
+        for (int j = 1, x; j <= k; j++) {
+            cin >> x;
+
+            s[i].set(x);
+        }
+
+        for (int j = 1; j < i; j++) {
+            if (!(s[i] & s[j]).count()) {
+                cout << "impossible" << endl;
+
+                exit(0);
+            }
+        }
+    }
+
+    cout << "possible" << endl;
+
+    return 0;
+}