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.

Source: https://leetcode.com/u/sessmrrifjpc/

  1. <!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;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#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: '94000518dfbb1459',cH: 'AkJETIW1oE_7nma57L0p6vvYAHIGpaVZIX2Ia4KB4E4-1747284683-1.2.1.1-VSHZNYW6mWqgscUASOdDhYisf.ts_hMQqaBg8N6UMDlA4BdefHZX6gy9Tvzt3qeT',cUPMDTk: "\/u\/sessmrrifjpc\/?__cf_chl_tk=t.F0QXR9t7lL0SMCWg71Ms0MK36JLVFsM3V.hQeHRPY-1747284683-1.0.1.1-ujJ5mykoxsiEWxAxSEPQk_VnfyBbY3zGjdq.t_pJsGM",cFPWv: 'g',cITimeS: '1747284683',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/u\/sessmrrifjpc\/?__cf_chl_f_tk=t.F0QXR9t7lL0SMCWg71Ms0MK36JLVFsM3V.hQeHRPY-1747284683-1.0.1.1-ujJ5mykoxsiEWxAxSEPQk_VnfyBbY3zGjdq.t_pJsGM",md: "VpUKfbev2c9UrGfrfvjG7TDjCHaEtSfI8F0DX1j_u_E-1747284683-1.2.1.1-k8z78nkmV6ZD6hi5_XHrx1Dczl2SkVpd4j82KJw1aq0GB6v.iH_JoQr3mZO4DvAuYho4EvFlLBmXfZ7srFnsrMUm0IH6FYbLemlDLVaJWekFmQ7P9SOYoFRS0d7G6r4C7nekggQUrjCPrZcEZRGAMrfSezUFdjqFW6cXPz5EowdSFX_otGau7E8FESQ.0SqKK0ouVNM.G78j5r4Vnbhr3n._6jA.G6NzFhO_6p_ue9Nz3wOEWrqHszfR3wnNphnIppcLzE7TBnvDJmLzv7udg.DwTjWdTZQsXInmSqIvAZL0gKCIJAxObup6IldUv5gF_bm2cOsN0lDB5pzDevo0ESuMphodJjzTs1hG8Ih.n1l.9yDJsmhYGmXzCEyrm1H9zzudlhO3gSRWIh8LW0KYwyI4p0SX244Ja48yraI7z.yymOACrB96lGwp0INQPR8AVTUXZOPrnkQwhYCwcR379CxN0beuKdXquFD67_Af7QygSE9enxaWt9M0WKBQ5mSZ1LstCkU5i26nRTAhuLvmtkqPSblaLrG6ScUTtPCuPY1a1IB373IwyusRk8La_hv0p_enyLdRtJ7d8oStqqxZY6TAol_SXG5cmJQ770UZxxY1w_1kQcpo18kRtyOVEHR.4fnHqhBdjGEUchjKuO483Uc4b7m8_RBG1NQuHkGWgUFyR0vAoZfIzJjzC6XjddVBbZnJT9iP01c_Fihmf.nF1MxyHOfkqLIb94YpB2_Z.yFlpaP76LIxxO560Y.kPqdxIu0lGZKUkGVXVCQbOPw.UHvh_TjwT4vyqaObl4z7v.8ZJFtxneRQMi04NKiITRFLlcjTn9KLa0oFmkzvxrMYDu0s1rDTNs.ecANyjaAvyZ57gxqwcO5tTAQ9F1L.XraL4xcBW_exWpgVlX.eT0ueGiPal9y0Lw1wf7s4zvSzbJo",mdrd: "2TbU0_pggQl4msk9peNq4BW0oG_2h9p0SnxG6dzj5KI-1747284683-1.2.1.1-2Gv4OtCQH63ILpNRztD5GJlS0wSSMo87cqVJUS4lu.UHiqNlMKyyXpeSgWHINXu6Bk3OOPbm_EZwwXmwsv5boUtH_drnpDLR1DWKxLirrzWguOZJDpWPWoQHshvfm9ufl5mW7PguxynbuFWRlqT6WOzwX_JvSrizTK444di.07twLbPWApba2B2RmL8xsApt_dHv5GNjryM5vdjFIUWuCzyo1YZ8axXwXCfOWX.Ondsn7l_zQ.MwpYYjSoRSC0VYH9vB5oWl0AAjFOVJDQLtroRDPbnyJlXLLABVsV8jho0xb4JtO1nqwpRQnrzjlRp4gpL.ywqcHxWSt3sd_DVBIwwuhiSR6znEAStM7blUmxKo.Qqf2WynjGm9dFJzReM4XIVtv9i_IUzKDjt1Z6KtbNpUCe9pJ5z9qeL70DSHRs8aHOlvLrzkfD3L0wHKNgZcRd9IKFyxG0ow80AnzDkm0vRgjeTDGSRwhfmuj3yONyJmshBhkmky8ICoA8FxMTTiLdDLdKm8oTbalpEbdHUJRO8HTWhzuVwC3LILx_LfJMy6RoCYh3BPYIti2jswOLbtXj5wDLtH9_J8Pmj8qQKvrEXoMx4Nwhe0VBJwb538LDAuRoRW6zONfWRdN1GAH0ExBKjTVEECeYBgOTWPbmQm92R67NIlQsyh.sKLL_yJ6m6CnxbIaeVVrxJzO7agoKylBMXM3I_35BCJxLOjrX0OLAH.fFXbuUQGZqsKVnjVb9w47yL7nO_FNYl6lELfGniLDidqrJOqgcPtAe5BtbXJJbWtdep8_qGD86ew2hwkrxP6hjM2ZyQ3KcEmZjCEIbj5.a8TT4c5IUA3Eh3dro4qrmc_Ub6geUpucevlAkZojrLTvFBnqf1cHvdLPl3uuZvSEbW4MW1rqA898TY7g5M7aleXwNWXyYwl9WqgNaruvhwTyjIimrMNjnEKIguC32UKV.MHOrypL0UFuOG2d6i6nDHQ8JjtXdKlOZulkyCvLHkz3Ftb7tExM3ZTdj0BIZaBBjehn0.tBhtlNeUfUp4_0GrcJHvl1.n3vWUJ0Rm4gm90_Iz38B0VyZyEHkII4RAioY8dr23zFgoHMc0qmZr2KzhvMZaVW69vVvzooEEoUhWY.EKm_71t7eSvKtXkUPOKzfSHJntqlOfVII1FwvDuPr5hnx9VJFhvK5weU1wmdd8CQm05RpQc87IpVTZgKc5_VuolzoKKl_h2IVSTgUFUpQg5Gc3LqmdaGn1BdQNF_55r2eQx.bRWcfh58sM5BqLF38k09EM8WZESMK8YYC8TGoKt8dwb6RiCmzJAjemyDXzOYDPoJIADxsiLUMx9yX9NmOwZCouRsWl5lbQTUhK_A1eHFqCVxNuGxqcbi3Z94IX4Gkgk98DZK0qdjDV2frhyHJMVE8UevjHhFlr0MOTT4Z_DK3D8WXba669f94RzIUhX0_TPbzcRAeHh4JCrXS3VvUTrIEHQTv_BnRNWXEUT6Y_vd1pZJ0cNwvS7NcqzrOSUX3cyW30wB8c.57iyKu3wBBOZehO.8f77y.8bbyaR.uIxJaOhALTxCt_Ullk0FZiWOUvnsP68bKN0KPkF8pDh5BXbLCRH0euXKTvSNbSbhr1B.zWoEJkZPe4nWBS9qMubkW_UxA959S_2pMzmoAoqkTdxRJ3RKAODTgGcD16mBoOcFAqOtp8JzEnEsHujwmWEvh.jPxQfTUTBVQaOiFwp1BwiWum6FJdjL.O.i_qirJFlwUyH5hwiJHVdc0_L5u8DexVxdsMXRYIkEvNpDTPXJXLN.I_S3p8WNLgPEQNlm2w9bmrV2aeTsfKt6QJRP61Zss0CyHX26Nw4DCXFdJxMos2TDqlcq2YFD0jevjhruw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=94000518dfbb1459';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\/sessmrrifjpc\/?__cf_chl_rt_tk=t.F0QXR9t7lL0SMCWg71Ms0MK36JLVFsM3V.hQeHRPY-1747284683-1.0.1.1-ujJ5mykoxsiEWxAxSEPQk_VnfyBbY3zGjdq.t_pJsGM" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda