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"translatedContent": "<p>给你一个列表&nbsp;<code>nums</code>&nbsp;,里面每一个元素都是一个整数列表。请你依照下面各图的规则,按顺序返回&nbsp;<code>nums</code>&nbsp;中对角线上的整数。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/04/23/sample_1_1784.png\" style=\"height: 143px; width: 158px;\"></strong></p>\n\n<pre><strong>输入:</strong>nums = [[1,2,3],[4,5,6],[7,8,9]]\n<strong>输出:</strong>[1,4,2,7,5,3,8,6,9]\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/04/23/sample_2_1784.png\" style=\"height: 177px; width: 230px;\"></strong></p>\n\n<pre><strong>输入:</strong>nums = [[1,2,3,4,5],[6,7],[8],[9,10,11],[12,13,14,15,16]]\n<strong>输出:</strong>[1,6,2,8,7,3,9,4,12,10,5,13,11,14,15,16]\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre><strong>输入:</strong>nums = [[1,2,3],[4],[5,6,7],[8],[9,10,11]]\n<strong>输出:</strong>[1,4,2,5,3,8,6,9,7,10,11]\n</pre>\n\n<p><strong>示例 4</strong></p>\n\n<pre><strong>输入:</strong>nums = [[1,2,3,4,5,6]]\n<strong>输出:</strong>[1,2,3,4,5,6]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10^5</code></li>\n\t<li><code>1 &lt;= nums[i].length &lt;=&nbsp;10^5</code></li>\n\t<li><code>1 &lt;= nums[i][j] &lt;= 10^9</code></li>\n\t<li><code>nums</code>&nbsp;中最多有&nbsp;<code>10^5</code>&nbsp;个数字。</li>\n</ul>\n",
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"hints": [
"Notice that numbers with equal sums of row and column indexes belong to the same diagonal.",
"Store them in tuples (sum, row, val), sort them, and then regroup the answer."