singleNumber

Author: zeroliu

src/singleNumber/singleNumber.java

@@ -0,0 +1,10 @@
+public class Solution {
+    public int singleNumber(int[] A) {
+        if (A == null || A.length == 0) { return 0; }
+        int num = A[0];
+        for (int i=1; i<A.length; i++) {
+            num ^= A[i];
+        }
+        return num;
+    }
+}