{"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":"MD","content":"一个n\\*n个格子的棋盘,从左上角**顶点**出发,只能向右或向下走,到达右下角**顶点**,如果不穿越对角线(但可接触对角线上的格点),这样的路径数有多少?"}},{"title":"Input","value":{"format":"MD","content":"每次输入一个数n(1\u0026lt;\u003dn\u0026lt;\u003d35),当n等于-1时结束输入。"}},{"title":"Output","value":{"format":"MD","content":"对于每个输入数据输出路径数,格式为\n`casenum n ans`\ncasenum就是第几个测试数据,n就是原输入,ans是路径数"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e1\n3\n12\n-1\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003e1 1 2\n2 3 10\n3 12 416024\u003c/pre\u003e"}}]}