{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv\u003e\n 给你一个矩阵,只由小写或大写字母构成。求出它的最大对称子矩阵的边长。\n\u003c/div\u003e \n\u003cdiv\u003e \n \u003cspan\u003e其中对称矩阵是一个k\u003c/span\u003e*k的矩阵,它的元素关于从左下角到右上角的对角线对称。\n \u003cbr\u003e \n \u003cspan\u003e例如下面这个3\u003c/span\u003e*\n \u003cspan\u003e3的矩阵是对称矩阵:\u003c/span\u003e\n \u003cbr\u003e \n \u003cspan\u003ecbx\u003c/span\u003e\n \u003cbr\u003e \n \u003cspan\u003ecpb\u003c/span\u003e\n \u003cbr\u003e \n \u003cspan\u003ezcc\u003c/span\u003e\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003e \u003cspan\u003e多组数据。每一组第一行是一个\u003c/span\u003e n (0\u0026lt;n\u0026lt;\u003d1000),下面是n行,每一行有n个字母,中间没有空格。数据以n\u003d\u003cspan\u003e0结束。\u003c/span\u003e\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e \u003cspan\u003e每组数据输出最大的对称矩阵的边长。\u003c/span\u003e\u003c/p\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e\r\n3\r\n\u003cspan\u003eabx\u003c/span\u003e\r\n\u003cspan\u003ecyb\u003c/span\u003e\r\n\u003cspan\u003ezca\u003c/span\u003e\r\n4\r\n\u003cspan\u003ezaba\u003c/span\u003e\r\n\u003cspan\u003ecbab\u003c/span\u003e\r\n\u003cspan\u003eabbc\u003c/span\u003e\r\n\u003cspan\u003ecacq\u003c/span\u003e\r\n0\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e\r\n3\r\n3\u003c/pre\u003e"}}]}