{"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":"题目描述","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 有两个长度相等,都只由小写字母构成的字符串A和B. 现在你有一把充满魔♂力的刷子。使用这把刷子,你可以把字符串中连续的一段区间刷♂成一个相同的字符,例如,对于字符串\"vandarkholme\",把区间[3,6]刷成\u0027d\u0027,可以变成\"vanddddholme\"。现在你要用这把刷♂子把字符串A变成B,最少要刷多少次? \n\u003c/div\u003e"}},{"title":"输入","value":{"format":"HTML","content":"多组数据,每组数据都有两行: \n\u003cbr\u003e第一行是字符串A. \n\u003cbr\u003e第二行是字符串B. \n\u003cbr\u003e字符串长度不超过100. \n\u003cbr\u003e"}},{"title":"输出","value":{"format":"HTML","content":"在单独的一行中输出结果"}},{"title":"样例输入","value":{"format":"HTML","content":"\u003cpre\u003ezzzzzfzzzzz\nabcdefedcba\nabababababab\ncdcdcdcdcdcd\u003c/pre\u003e"}},{"title":"样例输出","value":{"format":"HTML","content":"\u003cpre\u003e6\n7\u003c/pre\u003e"}}]}