{"id":45787,"date":"2025-07-30T01:11:14","date_gmt":"2025-07-29T17:11:14","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/45787.html"},"modified":"2025-07-30T01:11:14","modified_gmt":"2025-07-29T17:11:14","slug":"java-nc204_%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e6%9c%80%e5%a4%a7%e5%ae%bd%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/45787.html","title":{"rendered":"java-NC204_\u4e8c\u53c9\u6811\u7684\u6700\u5927\u5bbd\u5ea6"},"content":{"rendered":"<p>java-NC204 \u4e8c\u53c9\u6811\u7684\u6700\u5927\u5bbd\u5ea6<\/p>\n<p>import\u00a0java.util.*;<\/p>\n<p>\/*<br \/>\n\u00a0*\u00a0public\u00a0class\u00a0TreeNode\u00a0{<br \/>\n\u00a0*\u00a0\u00a0\u00a0int\u00a0val\u00a0&#061;\u00a00;<br \/>\n\u00a0*\u00a0\u00a0\u00a0TreeNode\u00a0left\u00a0&#061;\u00a0null;<br \/>\n\u00a0*\u00a0\u00a0\u00a0TreeNode\u00a0right\u00a0&#061;\u00a0null;<br \/>\n\u00a0*\u00a0\u00a0\u00a0public\u00a0TreeNode(int\u00a0val)\u00a0{<br \/>\n\u00a0*\u00a0\u00a0\u00a0\u00a0\u00a0this.val\u00a0&#061;\u00a0val;<br \/>\n\u00a0*\u00a0\u00a0\u00a0}<br \/>\n\u00a0*\u00a0}<br \/>\n\u00a0*\/<\/p>\n<p>\/**<br \/>\n\u00a0*\u00a0NC204\u00a0\u4e8c\u53c9\u6811\u7684\u6700\u5927\u5bbd\u5ea6<br \/>\n\u00a0*\u00a0&#064;author\u00a0d3y1<br \/>\n\u00a0*\/<br \/>\npublic\u00a0class\u00a0Solution\u00a0{<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0int\u00a0result\u00a0&#061;\u00a00;<br \/>\n\u00a0\u00a0\u00a0\u00a0\/\/\u00a0level(key)\u00a0-&gt;\u00a0leftest_idx(value)<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0HashMap&lt;Integer,\u00a0Integer&gt;\u00a0leftMap\u00a0&#061;\u00a0new\u00a0HashMap&lt;&gt;();<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u4ee3\u7801\u4e2d\u7684\u7c7b\u540d\u3001\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u540d\u5df2\u7ecf\u6307\u5b9a&#xff0c;\u8bf7\u52ff\u4fee\u6539&#xff0c;\u76f4\u63a5\u8fd4\u56de\u65b9\u6cd5\u89c4\u5b9a\u7684\u503c\u5373\u53ef<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u7a0b\u5e8f\u5165\u53e3<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root\u00a0TreeNode\u7c7b<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;return\u00a0int\u6574\u578b<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0public\u00a0int\u00a0widthOfBinaryTree\u00a0(TreeNode\u00a0root)\u00a0{<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0solution1(root);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0return\u00a0solution2(root);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0return\u00a0solution3(root);<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0dfs<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;return<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0int\u00a0solution1(TreeNode\u00a0root){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0preOrder(root,\u00a01,\u00a01);<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0result;<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u9012\u5f52:\u00a0\u524d\u5e8f\u904d\u5386<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0level<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0idx<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0void\u00a0preOrder(TreeNode\u00a0root,\u00a0int\u00a0level,\u00a0int\u00a0idx){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root\u00a0&#061;&#061;\u00a0null){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0key(level)\u5b58\u5728-\u76f4\u63a5\u53d6\u503c\u00a0key(level)\u4e0d\u5b58\u5728-\u5148put,\u518d\u53d6\u503c<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Integer\u00a0leftIdx\u00a0&#061;\u00a0leftMap.computeIfAbsent(level,\u00a0value-&gt;idx);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0result\u00a0&#061;\u00a0Math.max(result,\u00a0idx-leftIdx&#043;1);<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0preOrder(root.left,\u00a0level&#043;1,\u00a02*idx);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0preOrder(root.right,\u00a0level&#043;1,\u00a02*idx&#043;1);<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0bfs<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;return<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0int\u00a0solution2(TreeNode\u00a0root){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0levelOrderQueue(root,\u00a01,\u00a01);<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0result;<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u5c42\u5e8f\u904d\u5386:\u00a0Queue<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0level<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0idx<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0void\u00a0levelOrderQueue(TreeNode\u00a0root,\u00a0int\u00a0level,\u00a0int\u00a0idx){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root\u00a0&#061;&#061;\u00a0null){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Queue&lt;QueueNode&gt;\u00a0queue\u00a0&#061;\u00a0new\u00a0LinkedList&lt;&gt;();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue.offer(new\u00a0QueueNode(root,\u00a0level,\u00a0idx));<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0leftIdx\u00a0&#061;\u00a0idx;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0lastLevel\u00a0&#061;\u00a0level;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0currLevel,currIdx;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0QueueNode\u00a0queueNode;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!queue.isEmpty()){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queueNode\u00a0&#061;\u00a0queue.poll();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0currLevel\u00a0&#061;\u00a0queueNode.level;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0currIdx\u00a0&#061;\u00a0queueNode.idx;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(queueNode.node\u00a0!&#061;\u00a0null){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue.offer(new\u00a0QueueNode(queueNode.node.left,\u00a0currLevel&#043;1,\u00a02*currIdx));<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue.offer(new\u00a0QueueNode(queueNode.node.right,\u00a0currLevel&#043;1,\u00a02*currIdx&#043;1));<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u65b0\u5c42\u9996\u4e2a\u975e\u7a7a\u8282\u70b9<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(currLevel\u00a0!&#061;\u00a0lastLevel){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0lastLevel\u00a0&#061;\u00a0currLevel;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0leftIdx\u00a0&#061;\u00a0currIdx;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0result\u00a0&#061;\u00a0Math.max(result,\u00a0currIdx-leftIdx&#043;1);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0bfs<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;return<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0int\u00a0solution3(TreeNode\u00a0root){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0levelOrderDeque(root);<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0result;<br \/>\n\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\/**<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u5c42\u5e8f\u904d\u5386:\u00a0Deque<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0&#064;param\u00a0root<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0*\/<br \/>\n\u00a0\u00a0\u00a0\u00a0private\u00a0void\u00a0levelOrderDeque(TreeNode\u00a0root){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root\u00a0&#061;&#061;\u00a0null){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Deque&lt;TreeNode&gt;\u00a0deque\u00a0&#061;\u00a0new\u00a0LinkedList&lt;&gt;();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0deque.offer(root);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode\u00a0node;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!deque.isEmpty()){<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u53bb\u6389\u8be5\u5c42\u5de6\u8fb9\u7a7a\u8282\u70b9<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!deque.isEmpty()\u00a0&amp;&amp;\u00a0deque.peekFirst()&#061;&#061;null){<br 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