{"trustable":false,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e \u003cimg src\u003d\"http://img.blog.csdn.net/20161116134947166?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA\u003d\u003d/dissolve/70/gravity/Center\"\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003eWeiming\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e Lake, also named \"Un-named Lake\", is the most famous scenic spot\u0026nbsp;in Peking University.\u0026nbsp;It is located\u0026nbsp;in the north of the campus and is surrounded by walking paths, small gardens, and old red buildings with typical Chinese curly roofs. The lake was once the royal garden in Qing Dynasty. \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eBoya\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e tower stands on\u0026nbsp;a\u0026nbsp;little hill beside the lake. The lake and the tower form a distinctive landscape\u0026nbsp;and a symbol of Peking University.\u003c/p\u003e \n\u003cp\u003e \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eWeiming\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e Lake is a very good place for studying, reading, skating in the winter, and of course, jogging. More and more students and teachers run or walk around \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eWeiming\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e Lake every day and show how many paces they have covered in the mobile app \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eWeChat\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e Sports to get \"\u003cspan\u003e\u003cspan\u003e\u003cspan\u003eZans\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\" (\u003cspan\u003e\u003cspan\u003e\u003cspan\u003eapplauses\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e).\u003c/p\u003e \n\u003cp\u003e \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eACMer\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e X also enjoys jogging around \u003cspan\u003e\u003cspan\u003e\u003cspan\u003eWeiming\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e Lake. His watch can measure and record an altitude\u0026nbsp;value every meter. After a round of running, X collected the altitude data around the lake. Now he wants to find out the longest slope around the lake.\u0026nbsp;\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003e There are no more than 20 test cases.\u003c/p\u003e \n\u003cp\u003e Each case has two lines.\u003c/p\u003e \n\u003cp\u003e The first line is an integer N (2 \u0026lt;\u003d N \u0026lt;\u003d 100) meaning that the length of the road around the lake is N meters.\u003c/p\u003e \n\u003cp\u003e The second line contains N integers \u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003ea\u003csub\u003e1\u003c/sub\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e,a\u003csub\u003e2\u003c/sub\u003e...a\u003csub\u003eN\u003c/sub\u003e, (0\u0026lt;\u003d \u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003ea\u003csub\u003e1\u003c/sub\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e,a\u003csub\u003e2\u003c/sub\u003e...a\u003csub\u003eN\u003c/sub\u003e\u0026nbsp;\u0026lt;\u003d 100) indicating N altitude sample values around the lake. The samples are given in clockwise order, and the distance between two adjacent samples is one meter. Of course the distance between a\u003csub\u003e1\u003c/sub\u003e\u0026nbsp;and \u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003ea\u003csub\u003eN\u003c/sub\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u0026nbsp;is also one meter.\u003c/p\u003e \n\u003cp\u003e The input ends by a line of 0.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e For each test case, print the length of the longest slope in meters. A slope is a part of the road around the lake, and it must keep going up or going down. If there are no slope, print 0.\u003c/p\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e\r\n\u003c/pre\u003e \n\u003cp\u003e 4\u003c/p\u003e \n\u003cp\u003e 1 1 1 1\u003c/p\u003e \n\u003cp\u003e 8\u003c/p\u003e \n\u003cp\u003e 5 1 2 3 4 5 6 2\u003c/p\u003e \n\u003cp\u003e 6\u003c/p\u003e \n\u003cp\u003e 5 4 3 2 1 2\u003c/p\u003e \n\u003cp\u003e 10\u003c/p\u003e \n\u003cp\u003e 1 0 2 3 2 2 3 4 3 2\u003c/p\u003e \n\u003cp\u003e 0\u003c/p\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e\r\n\u003c/pre\u003e \n\u003cp\u003e 0\u003c/p\u003e \n\u003cp\u003e 5\u003c/p\u003e \n\u003cp\u003e 4\u003c/p\u003e \n\u003cp\u003e 4\u003c/p\u003e"}},{"title":"Hint","value":{"format":"HTML","content":"\u003cp\u003e \u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003esorces:\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u0026nbsp;\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e\u003cspan\u003e2016年ICPC北京站(感谢北大出题)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e"}}]}