{"trustable":false,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n section 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\u003cscript\u003e\n window.katexOptions \u003d {\n delimiters: [\n {left: \u0027\\\\(\u0027, right: \u0027\\\\)\u0027, display: false},\n {left: \u0027\\\\[\u0027, right: \u0027\\\\]\u0027, display: true}\n ]\n };\n\u003c/script\u003e\n","sections":[{"title":"Problem Statement","value":{"format":"HTML","content":"\u003csection\u003e\n \u003cp\u003eYou\u0027re given a row of $N$ squares. The $i^{th}$ square from the left contains an integer $a_i$.\u003c/p\u003e\n \u003cp\u003eInitially, all the squares are white. You can perform the following operation any number of times:\u003c/p\u003e\n \u003cul\u003e\n \u003cli\u003eSelect $K$ consecutive squares. And either paint \u003cb\u003e\u003ci\u003eall\u003c/i\u003e\u003c/b\u003e of them white, or paint \u003cb\u003e\u003ci\u003eall\u003c/i\u003e\u003c/b\u003e of them black. Here, the colors of the squares are \u003cb\u003e\u003ci\u003eoverwritten\u003c/i\u003e\u003c/b\u003e.\u003c/li\u003e\n \u003c/ul\u003e\n \u003cp\u003eAfter you finish performing the operations, the score will be calculated as the sum of the integers contained in the black squares. Find the maximum possible score.\u003c/p\u003e\n\u003c/section\u003e"}},{"title":"Constraints","value":{"format":"HTML","content":"\u003csection\u003e\n \u003cul\u003e\n \u003cli\u003e\u003cvar\u003e\\(1≤N≤10^5\\)\u003c/var\u003e\u003c/li\u003e\n \u003cli\u003e\u003cvar\u003e\\(1≤K≤N\\)\u003c/var\u003e\u003c/li\u003e\n \u003cli\u003e\u003cvar\u003e\\(a_i\\)\u003c/var\u003e is an integer.\u003c/li\u003e\n \u003cli\u003e\u003cvar\u003e\\(|a_i|≤10^9\\)\u003c/var\u003e\u003c/li\u003e\n \u003c/ul\u003e\n\u003c/section\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003csection\u003e\n \u003cp\u003eThe input is given from Standard Input in the following format:\u003c/p\u003e\n \u003cpre\u003e\u003cvar\u003e\\(N\\)\u003c/var\u003e \u003cvar\u003e\\(K\\)\u003c/var\u003e\n\u003cvar\u003e\\(a_1\\)\u003c/var\u003e \u003cvar\u003e\\(a_2\\)\u003c/var\u003e \u003cvar\u003e\\(...\\)\u003c/var\u003e \u003cvar\u003e\\(a_N\\)\u003c/var\u003e\n\u003c/pre\u003e\n\u003c/section\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003csection\u003e\n \u003cp\u003ePrint the maximum possible score.\u003c/p\u003e\n\u003c/section\u003e"}},{"title":"Sample 1","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 3\n-10 10 -10 10 -10\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e10\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e\n\u003c/section\u003e\u003csection\u003e\n \u003cp\u003ePaint the following squares black: the second, third and fourth squares from the left.\u003c/p\u003e\n\u003c/section\u003e"}},{"title":"Sample 2","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\u003e4 2\n10 -10 -10 10\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e20\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e\n\u003c/section\u003e\u003csection\u003e\n \u003cp\u003eOne possible way to obtain the maximum score is as follows:\u003c/p\u003e\n \u003cul\u003e\n \u003cli\u003ePaint the following squares black: the first and second squares from the left.\u003c/li\u003e\n \u003cli\u003ePaint the following squares black: the third and fourth squares from the left.\u003c/li\u003e\n \u003cli\u003ePaint the following squares white: the second and third squares from the left.\u003c/li\u003e\n \u003c/ul\u003e\n\u003c/section\u003e"}},{"title":"Sample 3","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\u003e1 1\n-10\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e0\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e\n\u003c/section\u003e\u003csection\u003e\n\u003c/section\u003e"}},{"title":"Sample 4","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\u003e10 5\n5 -4 -5 -8 -4 7 2 -4 0 7\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e17\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e\n\u003c/section\u003e\u003csection\u003e\n\u003c/section\u003e"}}]}