{"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 现有4个数,用这4个数可以排列组合出很多不同的4位数,你需要按从小到大的顺序输出这些4位数。 (注意4位数不能含有前导零)\n \u003cbr\u003e \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"每组数据占一行,代表4个数字(0\u0026lt;\u003d数字\u0026lt;\u003d9),如果4个数字都是0,则输入结束。 \n\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"对每组数据按从小到大的顺序输出所有能由这4个数组成的4位数,千位数字相同的在同一行,同一行中两个四位数之间用空格分隔。 \n\u003cbr\u003e每组输出数据间空一行,最后一组数据后面没有空行。 \n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e1 2 3 4\n1 1 2 3\n0 1 2 3\n0 0 0 0\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e1234 1243 1324 1342 1423 1432\n2134 2143 2314 2341 2413 2431\n3124 3142 3214 3241 3412 3421\n4123 4132 4213 4231 4312 4321\n\n1123 1132 1213 1231 1312 1321\n2113 2131 2311\n3112 3121 3211\n\n1023 1032 1203 1230 1302 1320\n2013 2031 2103 2130 2301 2310\n3012 3021 3102 3120 3201 3210\u003c/pre\u003e"}}]}