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/gbfivgbqtmtus/

  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: '93ac05ccd89059d4',cH: '2elzzGUlHWHWE3EFbs1dZXp.loSGtB1kQvJeRgHlwI8-1746403908-1.2.1.1-gt5SrFUAWrxn3bXCTt5h8WCRMo4n3M.w1ES8niUAl7x6SYcKPk.NWIo.S67ohSAN',cUPMDTk: "\/u\/gbfivgbqtmtus\/?__cf_chl_tk=vou9TS4H3IOJTz7cdhaK2uMKVD0Vwa1UGCvEUjkYvTs-1746403908-1.0.1.1-0ueo581uNHHGIrVO8oJ7di_YIyeb9dtjCj.HsrAqN5M",cFPWv: 'g',cITimeS: '1746403908',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/u\/gbfivgbqtmtus\/?__cf_chl_f_tk=vou9TS4H3IOJTz7cdhaK2uMKVD0Vwa1UGCvEUjkYvTs-1746403908-1.0.1.1-0ueo581uNHHGIrVO8oJ7di_YIyeb9dtjCj.HsrAqN5M",md: "VqLhCnsy_OlWzYZOLIo0Xd8bTpHrybx.E4KQAi6wqX0-1746403908-1.2.1.1-xYUyl60FdnmxlhPmhtKY3bI9FXbl6oQtm3UWfIivn0qLgLWt_66ZfU.P866tsvjEz8T0fDjlRQsIPDoVGvSzHnhiF6OfLko1XChR_3vW09uTeYBai5D.21CjkDlQZ5J51A1XfEOTvzADMnIZqSDPwDUA.8waX_G8oAp9jnLQBmxhPCP1w0dJRQmn1XbPahmDPb_rNfpCAiYKnoO7knx1eeTv..UzTz4YhnqWtgkE4c.DWKMnlDJ86DegL8OQQuO1LU4YGowR0TXsh9hAxVwENcwhM0PT9EQSe7k3Uty.TlIBdHCsF_6YKLo9GtBJKESn_.h2SDg_8duv0sb6.JrnZqqkawcsyk9KPx5thZJ137IRr_yKXa4hZWOdzko2_cGNaxTeXkLsHPOxI0knnvOqTAfmIJiBUDkgxWSAFkDU_12myJqrhCU9IHzSVL11u7qL9A2I7oIolZ7yNUFL6gUcs7VMAwTJIvAdwJ6Tl.slKOIhycjgh9IjUPO4T9.YYb7C5WGqp1eQsRzFC6IkxP16OHLFuYorMCaRvq9QI9w_MucJzzPkVqYoJtPepOigpyQKLaVGNq2wea0EN_Xz6YPOqRJx8YxvXoL4NPOu7v0nPlyg7PUq0WsjHaJw6W4vgeo0tZ9ViFVuSdoJ_eAebRGfjP8aipCD6QXMTaLrIR__1aQ_dpNFyLMb1QGOeMrttJZZrIk8.O8izHefGFpmojQy43QhPokzw0iuq46yt2ORk9.lF4NPjjTJcAa4js1jKI5moYlJ1dmTjBxEOFsubLYPHEZaDrCI874DAcSenGrA_l0yyKsS3e7Rg3GyB8dWwF6cmC2ouMcGp50VpSVKtxVQs.rPyub3ylr6NDJzEM_.tUaQ.cixGQBaJeYHILfp8tubohD1kTSXLzToPjrW5Lp5wX5nuTq4O6ZgUxAUJOAEWys7sQRrcwBFWZaREKvV.duqWhf35T9uzYT7wPI8fKKWg87Jp98pSvoCe4djr7XytzamIiDYqj_rbeHpOgTmKW4uA1c0m6eqlQenBQT1zmjpWg",mdrd: "6e8cq0KdE3pdEmfxlOcJ46N1ic2PKi5VDOwjNJRDQAY-1746403908-1.2.1.1-fWVlhWmci5NsvLJYpY.wx5RyDdkEcGmA1gPrrUe00kb_MtWMcfQHQHqmXd.nXcpiGCn9axRLQFoegUgi0asJRqXh19QurXwiTk9zRiAaPUjN5ZajZmOVsv__7moeurDoJXOBvi0.W4LUF.IW5lOdZJ67sRdkiij_fzM.PDb0QNoqPgKzkQUhpot4kspqhggTSZwAPYb6SINZyEZRCAFuKTY5YIkJYk7MjMvkw7aN6119NBca11Cu6JiwibRXAlqaDxqt8JqkcLT93gILGraHtl8oRqvz631VNtvaVnuLyIIGzTlVlPMnDytuTBeVNQCabubkX9VQNUokJ_AiK3cKRzXgPSbzui4WxMSqR7aL87FB1pStKk65G9n877L842jQQ8Gv_b2DwElA3EyJqUXfTNuCuKI1R3vyg2QOY9Z_DP13l4.yuowc6HLs1Suh1eY41bAxoThrl1Y9zFGdMWA41AV78q3sFbqsqodEm0SnN8SdAeB92xDwUIDOEHp9w3iKyQVCSDz8PUttJXPESnwteeS.yydhWsjlTmGIFRO95jSHXnPSF8UyGB1jqeVLs1xejitaFSVTvqk3FkeNIiWNlMylIJBLdAIRG8NVnkeDTrwpAK8SVaClmzbF92YmH8V9rs4sVYPy0WcwAUqkrhwx6VoLrlIAKue.hLxQ6JgmxAEl7IbADAwUK_Ix.cwljx0xXdIjkjOyCSKxfws8pKD5m4gaeO.GKYsQaqCwJGeVw4hc3YotJtGceO4_j5wzZcrIFtNP9cMdIuFIJI3.IMqlRIDIg7T2utTfvua28M4Tev5PYWJI0xw2z7E01j2Tk6bT3ejnmt.b.GAl_85j.av.kM1zeRVDDCsglyqzzNKvik8T_8taY1TiqjeuEC3Ei.m.UzaQIZpX6x1goFTA_vntmDT7Z5X18AS0DFQ.6FxphqKaeuC7d6ZrYgaKHUeR4p46LKb_S0ibAnjXziNeS.vk1.k8UYEFqYrV1XQX0f395SMeaGA6Pf0nXH63QkurqkTM5klrmHma1vUJcRclvHfDbhEHz7DrlIVtD6Jkfhq6denu9IOetIkCh8VPupbYe2ZCaBglYVRKvEXrgCNdjrP3rosvdNwd5VPxE.V38D2Xa4XG9tKOzzDF..RIdUWI15.PQJsok1JXjmhdte1ZP96vR7jxP4bREmF8_wR1_49wTTtKdxcbPfgcGxY1fCa0ZpwKK6nFNIG9YvmM_N_aT6eePDO875uDUm4H97GvAOd4qyCdHpj3aZm2CD92dfly_Sss_DhH9fzs1xmLQ9zgy_Kcx6ybw8W4GqhI1nxHvUbfn5DqkK3aQpGSDu6hWwwbQg0gA4msbuo4QZyFKNcuLjZkSz12IJd0K2kJYD2TNoghMhUl0QmM68Kaz5g1U6ybigeq0fLNQ34oYRl.zMB9splvLDwxRqRzovNip34QeYBAbJ_dS29a2d0afLbweJ.JQuhNR2UDdXIxa2l9o_8kE7gBlyGEAXMqjiK35Z.LURd.c3KD5QWlnbE8IWrXN0IMxiDyCxlYzGojbfp76lHlRGieBspogdgaW4_7a7KmqeuV797rYDC7HAOUGZ5OZ.flcqHQcITcmI20MhFL0cQ7rM9VWWbSeghFIIdQQD30ULkm0R4hdW1mofaScTXU3NjLeXaNjGYZHDgPUX8dl0_wrwGc779aAfozd.uZTByCxNl8wmke.RZ3VGh6r9PMULCcY9zARgXn2l6oo0AJDm8avvsRYvcyE.o1yL.yPeICnCz4XsB3M5AxeEFVJBj_ZvHQiPuvAlYOLHl2bMLJAp63Hav1uuCwCMKaH7xdhcvUWFrbdxZvWACrrZ2z1DJDCPgexJjQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=93ac05ccd89059d4';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\/gbfivgbqtmtus\/?__cf_chl_rt_tk=vou9TS4H3IOJTz7cdhaK2uMKVD0Vwa1UGCvEUjkYvTs-1746403908-1.0.1.1-0ueo581uNHHGIrVO8oJ7di_YIyeb9dtjCj.HsrAqN5M" + 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