{"trustable":true,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\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 type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eBạn được cho một chuỗi tam phân (đó là một chuỗi chỉ bao gồm các ký tự \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e0\u003c/span\u003e\u0027, \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e1\u003c/span\u003e\u0027 và \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e2\u003c/span\u003e\u0027).\u003c/p\u003e\u003cp\u003eBạn có thể hoán đổi bất kỳ hai ký tự liền kề nào \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e0\u003c/span\u003e\u0027 và \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e1\u003c/span\u003e\u0027 (tức là thay thế \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e01\u003c/span\u003e\" bằng \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e10\u003c/span\u003e\" hoặc ngược lại) hoặc bất kỳ hai ký tự liền kề nào \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e1\u003c/span\u003e\u0027 và \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e2\u003c/span\u003e\u0027 (tức là thay thế \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e12\u003c/span\u003e\" b"}}]}