new file: P14359.cpp

P14359.cpp

@@ -0,0 +1,36 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+const int MAX_N = 5e5 + 5;
+const int MAX_XOR = 2e6 + 5e5 + 5;
+
+int main()
+{
+    int n, k;
+    scanf("%d %d", &n, &k);
+
+    vector<int> a(n + 1), pre(n + 1);
+    for (int i = 1; i <= n; i++)
+    {
+        scanf("%d", &a[i]);
+        pre[i] = pre[i - 1] ^ a[i];
+    }
+
+    vector<int> last_pos(MAX_XOR, -1);
+    last_pos[0] = 0;
+
+    int ans = 0, seg_start = 0;
+    for (int r = 1; r <= n; r++)
+    {
+        int target = pre[r] ^ k;
+        if (last_pos[target] >= seg_start)
+        {
+            ans++;
+            seg_start = r;
+        }
+        last_pos[pre[r]] = r;
+    }
+
+    printf("%d\n", ans);
+    return 0;
+}