{"trustable":false,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\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 type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"MD","content":"一棵树,每个点有权值\n问Σ(max(i,j)-min(i,j)),max和min表示在树上路径的点权最大值和最小值"}},{"title":"Input","value":{"format":"MD","content":"第一行一个数n\u003c\u003d1000000\n第二行n个数表示点权 点权\u003c\u003d10^6\n接下来n-1行,表示树的边 保证边合法"}},{"title":"Output","value":{"format":"MD","content":"输出一个整数表示答案"}},{"title":"Example input","value":{"format":"MD","content":"4\n2 2 3 1\n1 2\n1 3\n1 4"}},{"title":"Example output","value":{"format":"MD","content":"6"}}]}