for Atom and RSS and KML
It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji"}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;padding-left:1.5rem;max-width:60rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{line-height:2.25rem;font-size:1.5rem;font-weight:500}@media (width <= 720px){.h2{line-height:1.5rem;font-size:1.25rem}}#challenge-error-text{background-image:url("data:image/svg+xml;base64,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");background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme: dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="360"></head><body><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt = {cvId: '3',cZone: 'leetcode.com',cType: 'managed',cRay: '96d464415c54c989',cH: '7G3P3u.WXk5VEYUGSUaTHnFXZAQy3fdKduem.koDJR4-1754880271-1.2.1.1-98DZ2jgCIyZKn_mBrwFYqZKnpzzYD17elFo_Kf4rwgXA0FiugdspWPtH3.m0tRUB',cUPMDTk:"\/u\/iftcnkohqfk\/?__cf_chl_tk=ZMQwBix4V1EfrKyvPfrXwA_Ikz7CLxgIrcm0U1Ykwms-1754880271-1.0.1.1-mjLYREQNjbL5DxfGPJsG0LBY4As0YqtFfAcmO2gX5zk",cFPWv: 'b',cITimeS: '1754880271',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/iftcnkohqfk\/?__cf_chl_f_tk=ZMQwBix4V1EfrKyvPfrXwA_Ikz7CLxgIrcm0U1Ykwms-1754880271-1.0.1.1-mjLYREQNjbL5DxfGPJsG0LBY4As0YqtFfAcmO2gX5zk",md: 'GXo.16WjvzlipJYaNFRNJt.q8qvVcHNW3TeEKjK6.kw-1754880271-1.2.1.1-x2S2RAh7.9WynVTtOk1emkpIQQZy0i19x3IzXixbDSjOp.jaYd0ekBouT.eGINyZV7ngQG4UCdmq8yXwTPmt6nFHGQKo1f7jMvKIWrgZyZ6nHLOmw9Ucz54BCZ6Kp7iipIJRGsfJ_WGSdtPcy7cGBDkyc6lPQcg9Th7hV4gEwV5sinzpcF.ockiGp0i5MYKupgdZtuf1.OyPTOP84dRaoetngWGb385tXuTFW7DTfbGG2NVyOGsi3yXj4aOg9AdHSPmEEFShSQW2FYvgVNCrmoC3XZQhypuijUPes7tiYiV4e2XWb7kPCLnk5FuE4nBHJDfwXTXjYHegWQnbfczuFj.vFGlA3E6itgpt8ADjRPPlyB.tlCXneS9R8JM_S4KCOMu1GnKqQjCHkA4c_VP4_3yqI.VHAYMVyOIOfRkBjB34etOTvGvMAaWaEz9mghMOMTQGIku0bxXDByZ7lYdXHzfDqEp00UoQHLSxdpLFURvXfuD6ZJqRqj9Abihxb._vh0im.wjgGVnKTqVATXFQ2yC0Wjm.saIIDqvRnZgWndDccpnnk2fX34Da3XnqqT6x0d6zQkqxLYmV8kG1EOR7vxBL4RK_gXVw0dfwOKJQFSvpQGSBALb.zAe8ZVnRvEcVqU84YSZlhWn1kzSCNFFZ_zI8gOhLqx5Now_nHVlVrrIsJEUvmRvcbQ4QqA_fJoNmCtSz0Tb5GRYUOTpbSvwX69QMsHZOQrToWo8Jz1lfOszcqR4CpAwdvYTJqJcfOQJGj0H2FP8FOjshlRi0w9xduqLNICFvDSYtuojmIJEPbBWTGbNF_4k.ZxsX6qU6lWYVp.s78QyzOHUF_vvPj91vWC751I9RQE17aXn3gVCJMihomXwiJewnlEM1rij8wNd00.WInpvU7v9p7BH7rb75p7vt.isbrf7rfiUW3v7vCvM',mdrd: '2y85MMroQTM15uiAT.ZTu42CTHrB2zabAmkJhiOHURQ-1754880271-1.2.1.1-d6W4nHdMW_7U6PURrVLPP9Thi2zY.ln3TOOAQk0UyZB9_dfR.yf.dmPCbsvZHbutdcq2W4RHun5CE.besq.VDuzshEScLJRd.FRex83llys2Uj2aWQLE087YeFKn6s28FrQ3PM1DVj1hFM3alE2aTyC_KXQLrlnnHUkAcUwO.WQj8Vl0Ws0OA_f_8pwnL8GzyHssKl1r0fcYBEHGite0ay0lZlZYEJKdVA4SFACQifK.AQALi4VkOqOCJwI1aewnhkieaCjLczTgNPqgl_4Ve6rxQaDlYSrwSzem9sMTHfpKHE7e70MGZFEslQxSisozhdTD6ISV6boVMOzIAR18Ox4uBjm5cJXp7pGcrH18gvqudhTEcXTDJWSFH9KPkrTbkIU37a0taGfDvH3bCYQFd9w.a9fYKSngMrg.QMEV_YfOcU5UJKHHQGG7eZ.SMybs9PmvsEc5qDioyVN1_0P9MTq_SqKSOz_nDSNOJGG3_E5g.ScG4I.hMO9AbmO28bknyy.ODfYJJDopGDyhPrvzzQ2OZ8fkgTchaxsoI280XQp0icfTgxNC05KnT3cq4W7D7EafCoXAUk2528GBiGLSdkP7mmJBvM.GeWlv6RASbefemnCnWRHYO3rl9nB0WXgqo9sp1Sx532XA8ycBI_SgWblLxFz7B_FOjflGC_LLa6YM_r1hynumAHY6B683BuYJ0.1JQrpqr0PXs5r985_b.I.AKfpAkCRPuUp2vS0JPaxhcwkgekFe4LXe1oqCfzxXxFC.siScQ03vGg7nb15pgO5_7Hfu4ijB1EHrXx.l6MfbSWfcpIdpEixzVYjc9v5O0wJQv4KvFIvw3YTu.Ql5nlmZ6OLE44q.GkM5P5ZVyccZsj30A972wJ7k6Ky_cY91IJ1WVbIRIXD0Y8R4iUDWOO_AF6bMuHW7CKZ7Mvf_nKXLL11MkQFibQ9XgrWVr7Hy9seVN1BlZlYpAonT8zPYkhEqJl6eqqCLMH_e1PKN8I.y4Gqzb5q0RhWzsccrYWq3ww4_n_9szbaq4zzbTkLisgGEr7FXlW7PDE_xoZMBGJ7DjtO4xBbATZCwzFNHuJVg311TJp3NOoqNbyWLpJ5z40MntxhL8K5GB3hJuCxN1raSJj_kqEuvOOj6YF5Uno1ajYsKlB6Dcfpy1AbXaGumvxw3fWXE.qJOi1gDwic763tbYis.VuiqhlQnb.m5sFCNf4s970spvKdHXEliGxTmlFM1aIKXLBGh.QnUVqyrZo65JStLmDDkXAZ5SdxPPl6yFHVz6mIVnDKy04VrQOArH7bI4H9zL.bsazJErGSi7yXiciYniz58K9nSiTITqSd4.kRclOM.t7yxnVXfr.bvtURayYXXhec5.m1yex85uJuUlictOrezkwA93ELZ6rAneJnXOqO.WSCpZ2sWZwmkLp1HS21MmaPTHYiAnLAO2MlMpwLZBYjIjgLt9oKNiLT48Vc2UNBrFlwcXSKxgqTHCgDZprj2yPp6kfo7r2GymsiGkQnMA9dl9nB4TbZbVl1j9eApe8_cpqzSSTc.qe9plUkMWYfyy1FU9JapnvUy.YBCPwiRxNq1ugXK5hs8WMhYn.JYJ1m.05aH_IJRNMZfFMASja05kpIZW9MkU2X2tTPJCeWckLbOYzGbN92PbLW3qVkpGlayf7L5Pz.0aEmAiNBaqlAlE25dJ1zxshMeqq6P7etWk6UsmJkG3RpPVXAQ87rNC5n.Rd.dld5Qx3oeuLhpZ1np_1TX4GH1gI3_qgMOXtCnwWwKtaYku1hSBi2DbbRgUerRPtIWULnFg2NV_Ic6QtmkG0OmnExmwF0UYugF5qlviAJPITAzMG3JwnY4WVgG77TBz3butuWQLD4JVl7R5emACGDB5Lx1U2Nylzw',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96d464415c54c989';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null,"\/u\/iftcnkohqfk\/?__cf_chl_rt_tk=ZMQwBix4V1EfrKyvPfrXwA_Ikz7CLxgIrcm0U1Ykwms-1754880271-1.0.1.1-mjLYREQNjbL5DxfGPJsG0LBY4As0YqtFfAcmO2gX5zk"+ window._cf_chl_opt.cOgUHash);a.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(a);}());</script></body></html>
Home · About · News · Docs · Terms