{"trustable":true,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n #problem-body \u003e pre {\n display: block;\n padding: 9.5px;\n margin: 0 0 10px;\n font-size: 13px;\n line-height: 1.42857143;\n word-break: break-all;\n word-wrap: break-word;\n color: #333;\n background: rgba(255, 255, 255, 0.5);\n border: 1px solid #ccc;\n border-radius: 6px;\n }\n\u003c/style\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv id\u003d\"problem-body\"\u003e\n\t\u003cp\u003eYou are given a tree (an acyclic undirected connected graph) with \u003cb\u003eN\u003c/b\u003e nodes, and edges numbered 1, 2, 3...\u003cb\u003eN\u003c/b\u003e-1.\r\n\u003c/p\u003e\u003cp\u003eWe will ask you to perfrom some instructions of the following form:\u003c/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\u003cb\u003eCHANGE i ti\u003c/b\u003e : change the cost of the i-th edge to ti\u003cbr\u003e\r\nor\r\n\u003c/li\u003e\u003cli\u003e\u003cb\u003eQUERY a b\u003c/b\u003e : ask for the maximum edge cost on the path from node a to node b\r\n\u003c/li\u003e\u003c/ul\u003e\r\n\r\n\u003ch3\u003eInput\u003c/h3\u003e\r\n\u003cp\u003eThe first line of input contains an integer \u003cb\u003et\u003c/b\u003e, the number of test cases (\u003cb\u003et\u003c/b\u003e \u0026lt;\u003d 20). t test cases follow.\r\n\u003c/p\u003e\u003cp\u003eFor each test case:\u003c/p\u003e \r\n\u003cul\u003e\r\n\u003cli\u003eIn the first line there is an integer \u003cb\u003eN\u003c/b\u003e (\u003cb\u003eN\u003c/b\u003e \u0026lt;\u003d 10000),\r\n\u003c/li\u003e\u003cli\u003eIn the next \u003cb\u003eN\u003c/b\u003e-1 lines, the i-th line describes the i-th edge: a line with three integers \u003cb\u003ea b c\u003c/b\u003e denotes an edge between \u003cb\u003ea\u003c/b\u003e, \u003cb\u003eb\u003c/b\u003e of cost \u003cb\u003ec\u003c/b\u003e (\u003cb\u003ec\u003c/b\u003e \u0026lt;\u003d 1000000),\r\n\u003c/li\u003e\u003cli\u003eThe next lines contain instructions \u003cb\u003e\"CHANGE i ti\"\u003c/b\u003e or \u003cb\u003e\"QUERY a b\"\u003c/b\u003e,\r\n\u003c/li\u003e\u003cli\u003eThe end of each test case is signified by the string \"\u003cb\u003eDONE\u003c/b\u003e\".\r\n\u003c/li\u003e\u003c/ul\u003e\r\n\u003cp\u003eThere is one blank line between successive tests.\r\n\r\n\u003c/p\u003e\u003ch3\u003eOutput\u003c/h3\u003e\r\n\u003cp\u003eFor each \"\u003cb\u003eQUERY\u003c/b\u003e\" operation, write one integer representing its result.\u003c/p\u003e\r\n\r\n\u003ch3\u003eExample\u003c/h3\u003e\r\n\r\n\u003cdiv\u003e\u003ctable class\u003d\"vjudge_sample\"\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e1\r\n\r\n3\r\n1 2 1\r\n2 3 2\r\nQUERY 1 2\r\nCHANGE 1 3\r\nQUERY 1 2\r\nDONE\r\n\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e1\r\n3\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\r\n\n\u003c/div\u003e"}}]}