{"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":"\u003cdiv\u003e\n 请用最短的时间到达目的地(假设每一路公交车都只在起点站和终点站停,而且随时都会开)。\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cdiv\u003e\n 输入数据有多组,每组的第一行是公交车的总数N(0\u0026lt;\u003dN\u0026lt;\u003d10000);\n \u003cbr\u003e \n \u003cspan\u003e\u003cspan\u003e第二行有徐总的所在地start,他的目的地end;\u003c/span\u003e\u003c/span\u003e\n \u003cbr\u003e 接着有n行,每行有站名s,站名e,以及从s到e的时间整数t(0\u0026lt;t\u0026lt;100)( \n \u003cspan\u003e\u003cspan\u003e每个地名是一个长度不超过30的字符串\u003c/span\u003e\u003c/span\u003e)。\n \u003cbr\u003e \n \u003cspan\u003e\u003cspan\u003enote:一组数据中地名数不会超过150个。\u003c/span\u003e\u003c/span\u003e\n \u003cbr\u003e \n \u003cspan\u003e\u003cspan\u003e如果N\u003c/span\u003e\u003c/span\u003e\u003d\u003d \n \u003cspan\u003e\u003cspan\u003e-1,表示输入结束。\u003c/span\u003e\u003c/span\u003e\n\u003c/div\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cdiv\u003e\n 如果能到达目的地,输出最短的时间;否则,输出“-1”。\n\u003c/div\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cpre\u003e\n6\nxiasha westlake\nxiasha station 60\n\u003cspan\u003exiasha\u003c/span\u003e \u003cspan\u003eShoppingCenterofHangZhou\u003c/span\u003e 30\nstation westlake 20\nShoppingCenterofHangZhou supermarket 10\nxiasha supermarket 50\nsupermarket westlake 10\n-1 \u003c/pre\u003e \n\u003c/div\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cpre\u003e\n50\n\nHint:\nThe best route is:\nxiasha-\u0026gt;ShoppingCenterofHangZhou-\u0026gt;supermarket-\u0026gt;westlake\n\n\u003c/pre\u003e \n\u003c/div\u003e"}},{"title":"Hint","value":{"format":"HTML","content":"\u003cp\u003e \u0026nbsp;\u003c/p\u003e"}}]}