LMIO

Author: dolphingarlic

LMIO/LMiO 17-faktai.cpp

@@ -0,0 +1,42 @@
+/*
+LMiO 2017 Faktai
+- Bitmask stuff
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+bitset<200> bs[20];
+
+int main() {
+    int n, m;
+    scanf("%d %d", &n, &m);
+    for (int i = 0; i < n; i++) {
+        int k;
+        scanf("%d", &k);
+        for (int j = 0; j < k; j++) {
+            int f;
+            scanf("%d", &f);
+            bs[f - 1][i] = 1;
+        }
+    }
+
+    int lb = n, ub = 0;
+    for (int mask = 0; mask < (1 << m); mask++) {
+        bitset<200> cov;
+        bool good = true;
+        for (int i = 0; i < m; i++) if (mask & (1 << i)) {
+            if ((cov & bs[i]).count()) {
+                good = false;
+                break;
+            }
+            cov |= bs[i];
+        }
+        if (good && cov.count() == n) {
+            lb = min(lb, __builtin_popcount(mask));
+            ub = max(ub, __builtin_popcount(mask));
+        }
+    }
+    printf("%d %d", lb, ub);
+    return 0;
+}