[20260308] BOJ / G1 / XOR 합 3 / 권혁준

khj20006/202603/08 BOJ G1 XOR 합 3.md

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+```java
+import java.io.*;
+import java.util.*;
+
+public class BOJ13710 {
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        int N = Integer.parseInt(br.readLine());
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int[] arr = new int[N];
+        for(int i=0;i<N;i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+        }
+
+        long ans = 0;
+        for(int k=0;k<30;k++) {
+            long odd = 0, even = 1;
+            int sum = 0;
+            for(int i=0;i<N;i++) {
+                int a = (arr[i] & (1 << k)) == 0 ? 0 : 1;
+                sum ^= a;
+                if(sum == 0) {
+                    ans += odd * (1L << k);
+                    even++;
+                }
+                else {
+                    ans += even * (1L << k);
+                    odd++;
+                }
+            }
+        }
+        bw.write(ans + "\n");
+        bw.close();
+    }
+
+}
+```