3164. 线性基

https://www.acwing.com/problem/content/submission/code_detail/14619728/

AcWing/3164/3164.cpp

@@ -0,0 +1,45 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int n;
+unsigned long long x, a[N], ans;
+
+inline void insert(unsigned long long x) {
+    for (int i = 63; ~i; i--) {
+        if (x & (1ull << i)) {
+            if (a[i]) {
+                x ^= a[i];
+            } else {
+                a[i] = x;
+
+                return;
+            }
+        }
+    }
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> x;
+
+        insert(x);
+    }
+
+    for (int i = 63; ~i; i--) {
+        if ((ans ^ a[i]) > ans) ans ^= a[i];
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}