{"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":"[NWUACM] \n\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在一个无向图上,已知起点和终点,请你计算出要从起点到终点,最短路的权值。 \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"本题目包含多组数据,请处理到文件结束。 \n\u003cbr\u003e每组数据第一行包含两个正整数N和M(0\u0026lt;N\u0026lt;200,0\u0026lt;M\u0026lt;1000),分别代表现有节点的数目和边总数目。节点分别以0~N-1编号。 \n\u003cbr\u003e接下来是M行边信息。每一行有三个整数A,B,X(0\u0026lt;\u003dA,B\u0026lt;N,A!\u003dB,0\u0026lt;X\u0026lt;10000),表示A和B之间有一条长度为X的边。 \n\u003cbr\u003e再接下一行有两个整数S,T(0\u0026lt;\u003dS,T\u0026lt;N),分别代表起点和终点。"}},{"title":"Output","value":{"format":"HTML","content":"对于每组数据,请在一行里输出最短路的权值。如果不存在从S到T的路线,就输出-1. \n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e3 3\n0 1 1\n0 2 3\n1 2 1\n0 2\n3 1\n0 1 1\n1 2\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e2\n-1\u003c/pre\u003e"}}]}