{"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":"问题描述","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cp\u003e给定字符串 \u003cvar\u003es\u003c/var\u003e 和 \u003cvar\u003et\u003c/var\u003e。请找出一个最长的子序列,它既是 s 的子序列又是 t 的子序列。\u003c/p\u003e\u003cscript defer src\u003d\u0027CDN_BASE_URL/74926ad0182dbb356381d53a4e4b1439?v\u003d1563346779\u0027\u003e\u003c/script\u003e\u003cscript defer src\u003d\u0027CDN_BASE_URL/1de9ac635832b17871587cdd2336341c?v\u003d1563346779\u0027\u003e\u003c/script\u003e\u003cscript defer src\u003d\u0027CDN_BASE_URL/c9c34e29d77252102cd6d6f257f3a667?v\u003d1563346779\u0027\u003e\u003c/script\u003e\u003cscript defer src\u003d\u0027CDN_BASE_URL/57b8c019c6e6f632d03c6077520eb5f6?v\u003d1563346779\u0027\u003e\u003c/script\u003e"}},{"title":"提示","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cp\u003e一个字符串 x 的\u003cem\u003e子序列\u003c/em\u003e 定义如下:删除字符串 x 中 0 个或多个字母,把剩下的字母按顺序连起来,注意不得改变剩余字母的顺序。\u003c/p\u003e"}},{"title":"限制条件","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cul\u003e \n \u003cli\u003e\u003cvar\u003es\u003c/var\u003e 和 \u003cvar\u003et\u003c/var\u003e 是由小写字母组成的英文字符串。\u003c/li\u003e \n \u003cli\u003e\u003cvar\u003e1 ≤ |s|, |t| ≤ 3000\u003c/var\u003e\u003c/li\u003e \n\u003c/ul\u003e"}},{"title":"输入","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cp\u003e输入的标准格式如下:\u003c/p\u003e \n\u003cpre\u003e\u003cvar\u003es\u003c/var\u003e\n\u003cvar\u003et\u003c/var\u003e\n\u003c/pre\u003e"}},{"title":"输出","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cp\u003e输出一个最长的子序列,注意它既是 \u003cvar\u003es\u003c/var\u003e 的子序列也是 \u003cvar\u003et\u003c/var\u003e 的子序列。如果有多个同样长度的最长子序列,输出其中一个即可。\u003c/p\u003e"}},{"title":"样例1输入","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eaxyb\nabyxb\n\u003c/pre\u003e"}},{"title":"样例1输出","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eaxb\n\u003c/pre\u003e \n\u003cp\u003e答案是 \u003ccode\u003eaxb\u003c/code\u003e 或者 \u003ccode\u003eayb\u003c/code\u003e。\u003c/p\u003e"}},{"title":"样例2输入","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eaa\nxayaz\n\u003c/pre\u003e"}},{"title":"样例2输出","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eaa\n\u003c/pre\u003e"}},{"title":"样例3输入","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003ea\nz\n\u003c/pre\u003e"}},{"title":"样例3输出","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003e\n\u003c/pre\u003e \n\u003cp\u003e答案是一个空字符 ‘ ’ 。\u003c/p\u003e"}},{"title":"样例4输入","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eabracadabra\navadakedavra\n\u003c/pre\u003e"}},{"title":"样例4输出","value":{"format":"HTML","content":"\u003ch3\u003e\u003c/h3\u003e\n\u003cpre\u003eaaadara\n\u003c/pre\u003e"}}]}