{"trustable":false,"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":"\u003cscript type\u003d\u0027text/x-mathjax-config\u0027\u003eMathJax.Hub.Config({tex2jax: { inlineMath: [[\u0027$\u0027,\u0027$\u0027]] } }); \u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027 src\u003d\u0027https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\u0027\u003e\u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027\u003esetTimeout(function(){MathJax.Hub.Queue([\u0027Typeset\u0027, MathJax.Hub, \u0027left_view\u0027]);}, 2000);\u003c/script\u003e\n\u003cdiv class\u003d\"panel_content\"\u003e \n \u003ccenter\u003e \n \u003cimg style\u003d\"max-width:100%;\" SRC\u003d\"CDN_BASE_URL/b85340f291714255f8f4a743cb84930b?v\u003d1553088787\"\u003e \n \u003c/center\u003e \n\u003c/div\u003e\n\u003cbr\u003e你需要模拟一个编辑器。\n\u003cbr\u003e编辑器的初始时,有一个空序列。\n\u003cbr\u003e有5个操作,需要完成。\n\u003cbr\u003eI x: 把x插入到光标之后\n\u003cbr\u003eD: 删除光标之前的元素\n\u003cbr\u003eL:如果光标不在最前,把光标向左移动一次\n\u003cbr\u003eR:如果光标不在最后,把光标向右移动一次\n\u003cbr\u003eQ k:设光标之前的序列为a1,a2,...,an.求个数不超过k的最大前缀和。\n\u003cbr\u003e\n\n\n"}},{"title":"Input","value":{"format":"HTML","content":"\u003cbr\u003e有多组测试数据\n\u003cbr\u003e每组测数据,第一行一个整数C,接下来C行,每行表示一个操作。\n数据保证Q操作时,k不会超过光标前面数的个数。\n"}},{"title":"Output","value":{"format":"HTML","content":"对于每个Q操作,输出相应的结果。"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e8\nI 2\nI -1\nI 1\nQ 3\nL\nD\nR\nQ 2\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e2\n3\n\n \n \u003ci style\u003d\"font-size:1px\"\u003e \u003c/i\u003e\u003c/pre\u003e"}},{"title":"Hint","value":{"format":"HTML","content":"\u003cpre\u003e\nThe following diagram shows the status of sequence after each instruction:\n\n \n \u003cimg SRC\u003d\"CDN_BASE_URL/e451000af3bd10d90df6fad8f1ba6ad6?v\u003d1553088787\"\u003e\n\n \n \u003c/pre\u003e"}}]}