0332.重新安排行程 添加Java代码

problems/0332.重新安排行程.md

@@ -261,6 +261,43 @@ for (pair<string, int>target : targets[result[result.size() - 1]])
 ## 其他语言版本
 
 ### java 
+	
+```java
+class Solution {
+    private LinkedList<String> res;
+    private LinkedList<String> path = new LinkedList<>();
+
+    public List<String> findItinerary(List<List<String>> tickets) {
+        Collections.sort(tickets, (a, b) -> a.get(1).compareTo(b.get(1)));
+        path.add("JFK");
+        boolean[] used = new boolean[tickets.size()];
+        backTracking((ArrayList) tickets, used);
+        return res;
+    }
+
+    public boolean backTracking(ArrayList<List<String>> tickets, boolean[] used) {
+        if (path.size() == tickets.size() + 1) {
+            res = new LinkedList(path);
+            return true;
+        }
+
+        for (int i = 0; i < tickets.size(); i++) {
+            if (!used[i] && tickets.get(i).get(0).equals(path.getLast())) {
+                path.add(tickets.get(i).get(1));
+                used[i] = true;
+
+                if (backTracking(tickets, used)) {
+                    return true;
+                }
+
+                used[i] = false;
+                path.removeLast();
+            }
+        }
+        return false;
+    }
+}
+```
 
 ```java
 class Solution {