: Print levels in reverse order.
Code

[{"language":"Java","code":"public class Solution {\n    public void reverseLevelSumHierarchy(int[] arr) {\n        List<List<Integer>> levels = new ArrayList<>();\n        List<Integer> currentLevel = new ArrayList<>();\n        \n        // Initialize first level\n        for (int num : arr) {\n            currentLevel.add(num);\n        }\n        \n        // Generate levels\n        while (!currentLevel.isEmpty()) {\n            levels.add(new ArrayList<>(currentLevel));\n            List<Integer> nextLevel = new ArrayList<>();\n            for (int i = 0; i < currentLevel.size() - 1; i++) {\n                nextLevel.add(currentLevel.get(i) + currentLevel.get(i + 1));\n            }\n            currentLevel = nextLevel;\n        }\n        \n        // Reverse levels and print\n        for (int i = levels.size() - 1; i >= 0; i--) {\n            System.out.println(levels.get(i));\n        }\n    }\n\n    public static void main(String[] args) {\n        Solution sol = new Solution();\n        \n        System.out.println(\"Example 1:\");\n        sol.reverseLevelSumHierarchy(new int[]{1, 2, 3, 4});\n        \n        System.out.println(\"\\nExample 2:\");\n        sol.reverseLevelSumHierarchy(new int[]{5, 6, 7});\n    }\n}","lang":"java","html":"<pre class=\"shiki shiki-themes github-light github-dark\" style=\"background-color:#fff;--shiki-dark-bg:#24292e;color:#24292e;--shiki-dark:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">public</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> class</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> Solution</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> {</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">    public</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> void</span><span style=\"color:#6F42C1;--shiki-dark:#B392F0\"> reverseLevelSumHierarchy</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">(</span><span style=\"color:#D73A49;--shiki-dark:#F97583\">int</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">[] </span><span style=\"color:#E36209;--shiki-dark:#FFAB70\">arr</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">) {</span></span>\n<span class=\"line\"><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">        List&#x3C;List&#x3C;</span><span style=\"color:#D73A49;--shiki-dark:#F97583\">Integer</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">>> levels </span><span style=\"color:#D73A49;--shiki-dark:#F97583\">=</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> new</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> ArrayList&#x3C;>();</span></span>\n<span class=\"line\"><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">        List&#x3C;</span><span style=\"color:#D73A49;--shiki-dark:#F97583\">Integer</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">> currentLevel </span><span style=\"color:#D73A49;--shiki-dark:#F97583\">=</span><span style=\"color:#D73A49;--shiki-dark:#F97583\"> new</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> ArrayList&#x3C;>();</span></span>\n<span class=\"line\"><span style=\"color:#24292E;--shiki-dark:#E1E4E8\">        </span></span>\n<span class=\"line\"><span style=\"color:#6A737D;--shiki-dark:#6A737D\">        // Initialize first level</span></span>\n<span class=\"line\"><span style=\"color:#D73A49;--shiki-dark:#F97583\">        for</span><span style=\"color:#24292E;--shiki-dark:#E1E4E8\"> (</span><span style=\"color:#D73A49;
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