{"trustable":true,"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 class\u003d\"panel_content\"\u003e Kingdom Y is in the war with kingdom X. Kingdom X consists of N cities,there are N-1 bidirectional roads which are all 1 long ,each of them connect a pair of cities,the N cities are all connect by the N-1 bidirectional.People can travel through the roads.\u003cbr\u003e\u003cbr\u003e Now kingdom Y is going to bomb kingdom X. Every city of kingdom X has its own value W. If city i was to be bombed, then all the cities that lie within the distance W(i) from city i would be destroyed as well. The king of kingdom Y wants to know the minimum bombing time that can destroy all the cities in kingdom X. Could you help him?\u003cbr\u003e\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":" There are multiple test cases. Please process till EOF.\u003cbr\u003e In each test case: \u003cbr\u003e First line: an integer n(n\u0026lt;\u003d10^5) indicating the number of city\u003cbr\u003e Second line:contain n numbers w[i](0\u0026lt;\u003dw[i]\u0026lt;\u003d100) ,indicating that the value of city[i],\u003cbr\u003e Next n - 1 lines: each contains two numbers ui and vi, (1 ≤ ui,vi\u0026lt;\u003dn), indicates that there’s one road connecting city ui and vi.\u003cbr\u003e\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":" For each case,output one number, denotes the minimum number of bombing times."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e5\r\n1 1 1 1 1\r\n1 2\r\n2 3\r\n3 4\r\n4 5\r\n\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}