Reader

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Could not parse statement.

';\",\n \" // Fix relative image paths\",\n \" body.querySelectorAll('img').forEach(function(img) {\",\n \" var src = img.getAttribute('src') || '';\",\n \" if (src.charAt(0) === '/') img.src = 'https://atcoder.jp' + src;\",\n \" });\",\n \" document.getElementById('problem').style.display = 'block';\",\n \" // Typeset — MathJax is configured for $...$ so just call it\",\n \" if (window.MathJax && MathJax.typesetPromise) {\",\n \" MathJax.typesetPromise([body]).catch(function(e) { console.error(e); });\",\n \" }\",\n \" setLoading(false);\",\n \" })\",\n \" .catch(function(e) {\",\n \" showErr('Failed: ' + e.message);\",\n \" setLoading(false);\",\n \" });\",\n \"}\",\n \"\",\n \"document.getElementById('url-input').addEventListener('keydown', function(e) {\",\n \" if (e.key === 'Enter') loadProblem();\",\n \"});\",\n ].join(\"\\n\");\n\n // MathJax config as a plain string — no template literal escaping issues\n const mathJaxConfig = [\n \"window.MathJax = {\",\n \" tex: {\",\n \" inlineMath: [['$', '$']],\",\n \" displayMath: [['$$', '$$']],\",\n \" processEscapes: true,\",\n \" packages: {'[+]': ['ams']}\",\n \" },\",\n \" options: {\",\n \" skipHtmlTags: ['script','noscript','style','textarea','pre','code'],\",\n \" processHtmlClass: 'math'\",\n \" },\",\n \" startup: { typeset: false }\",\n \"};\",\n ].join(\"\\n\");\n\n return `\n\n\n\n\nReader\n\n\n\n\n\n

\n \n \n

Source ↗

\n\n\n`;\n}\n\nexport default async function (req: Request): Promise {\n const corsHeaders = {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type, X-Atcoder-Url\",\n };\n\n if (req.method === \"OPTIONS\") {\n return new Response(null, { headers: corsHeaders });\n }\n\n // ── API MODE ──────────────────────────────────────────────────────────────\n if (req.method === \"GET\" && req.headers.get(\"X-Atcoder-Url\")) {\n const taskUrl = req.headers.get(\"X-Atcoder-Url\")!;\n\n if (!taskUrl.startsWith(\"https://atcoder.jp/\")) {\n return Response.json(\n { error: \"Only atcoder.jp URLs are allowed\" },\n { status: 403, headers: corsHeaders },\n );\n }\n\n // Always fetch English version server-side too\n const fetchUrl = taskUrl.includes(\"lang=\")\n ? taskUrl.replace(/lang=[a-z]+/, \"lang=en\")\n : taskUrl + (taskUrl.includes(\"?\") ? \"&lang=en\" : \"?lang=en\");\n\n const upstream = await fetch(fetchUrl, {\n headers: {\n \"User-Agent\": \"Mozilla/5.0 (compatible; Reader/1.0)\",\n \"Accept\": \"text/html,application/xhtml+xml\",\n \"Accept-Language\": \"en-US,en;q=0.9\",\n },\n });\n\n if (!upstream.ok) {\n return Response.json(\n { error: `Upstream returned ${upstream.status}` },\n { status: upstream.status, headers: corsHeaders },\n );\n }\n\n const html = await upstream.text();\n\n // Title — AtCoder puts it in \n const titleMatch = html.match(/([\\s\\S]*?)<\\/span>/);\n const title = titleMatch\n ? titleMatch[1].replace(/<[^>]+>/g, \"\").trim()\n : \"\";\n\n // Time / memory\n const timeLimitMatch = html.match(\n /Time Limit[^<]*<\\/td>\\s*]*>([^<]+)/,\n );\n const memLimitMatch = html.match(\n /Memory Limit[^<]*<\\/td>\\s*]*>([^<]+)/,\n );\n const timeLimit = timeLimitMatch ? timeLimitMatch[1].trim() : \"\";\n const memLimit = memLimitMatch ? memLimitMatch[1].trim() : \"\";\n\n // Extract #task-statement\n const broadMatch = html.match(\n /]+id=\"task-statement\"[^>]*>([\\s\\S]{100,})/,\n );\n let statement = \"\";\n if (broadMatch) {\n const raw = broadMatch[1];\n const cutoff = raw.indexOf('

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