{"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":"\u003cscript type\u003d\u0027text/x-mathjax-config\u0027\u003eMathJax.Hub.Config({tex2jax: { inlineMath: [[\u0027$\u0027,\u0027$\u0027]] } }); \u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027 src\u003d\u0027https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\u0027\u003e\u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027\u003esetTimeout(function(){MathJax.Hub.Queue([\u0027Typeset\u0027, MathJax.Hub, \u0027left_view\u0027]);}, 2000);\u003c/script\u003e\n\u003cdiv class\u003d\"panel_content\"\u003e\n WBH垃圾丢错啦,他想知道有多少种丢错垃圾的可能,总共有n袋垃圾和n个垃圾桶,假设wbh全丢错了呢,那么他有多少种丢错的可能,请输出一个值代表wbh有多少种可能全丢错 \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"输入数据包含多个多个测试实例,每个测试实例占用一行,每行包含一个正整数n(1\u0026lt;n\u0026lt;\u003d20),n表示垃圾桶和垃圾袋的量。"}},{"title":"Output","value":{"format":"HTML","content":"对于每行输入请输出可能的错误方式的数量,每个实例的输出占用一行。"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e2\n3\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e1\n2\u003c/pre\u003e"}}]}