{"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 给出一个 N*N 的矩阵,其中的元素等于 0 或者 1. 你可以交换任意两行或者任意两列. 你能找到一种方法使所有正对角线(即(1,1),(2,2),(3,3)...)元素都等于1吗?\n\u003c/div\u003e"}},{"title":"输入","value":{"format":"HTML","content":"输入中包含多组测试样例. 每组测试数据第一行包含一个整数 N (1 \u0026lt;\u003d N \u0026lt;\u003d 100). 接下来的 N 行, 每行包含 N 个数字 (0 or 1), 由空格隔开,表示这个 N*N 的矩阵."}},{"title":"输出","value":{"format":"HTML","content":"对于每组测试数据,第一行输出总交换次数M. 接下来的M行,格式为 “R a b” 或者 “C a b”,表示交换行a和行b,或者交换列a和列b. (1 \u0026lt;\u003d a, b \u0026lt;\u003d N). 任何正确的答案都将被接受.\n\u003cbr\u003e\n\u003cbr\u003e如果不可能使所有正对角线元素都等于1,输出一行“-1”. \n\u003cbr\u003e"}},{"title":"样例输入","value":{"format":"HTML","content":"\u003cpre\u003e2\n0 1\n1 0\n2\n1 0\n1 0\u003c/pre\u003e"}},{"title":"样例输出","value":{"format":"HTML","content":"\u003cpre\u003e1\nR 1 2\n-1\u003c/pre\u003e"}},{"title":"提示","value":{"format":"HTML","content":"伟大的毛老师曾经说过:既然男女能够做匹配,那么花和草也能,行和列也能"}}]}