P4570 [BJWC2011]元素

https://www.luogu.com.cn/record/77009664

Luogu/P4570/P4570.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <algorithm>
+#include <functional>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1005;
+
+int n, ans;
+std::pair<int, unsigned long long> a[N];
+unsigned long long p[N];
+
+inline bool insert(unsigned long long x) {
+    for (int i = 0; i <= 61; i++) {
+        if (x & (1ull << i)) {
+            if (p[i]) {
+                x ^= p[i];
+            } else {
+                p[i] = x;
+
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].second >> a[i].first;
+    }
+
+    std::sort(a + 1, a + 1 + n, std::greater<std::pair<int, unsigned long long>>());
+
+    for (int i = 1; i <= n; i++) {
+        if (insert(a[i].second)) {
+            ans += a[i].first;
+        }
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}