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/gaeyhwcmkgq/

  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: '93ad711e2f8f3931',cH: 'KOjNSK_IpBlhVH8pf.wOhgiTDilrg_uULCOzhkLUFJg-1746418790-1.2.1.1-90oXTL7mFdiKx7t7ATnQ4hIvkhFJ1Ql3JvkELZ4RUdjWRLVOBZdR1o4ljUqE6yof',cUPMDTk: "\/u\/gaeyhwcmkgq\/?__cf_chl_tk=5nVFdXPzbpriBXq_awplbBIwnZzCDLVihlWHEw_61HA-1746418790-1.0.1.1-UDeIoybGQTwLWbsb8SHQUSyzDgmCXk9rCHNc0h5mjb0",cFPWv: 'g',cITimeS: '1746418790',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/u\/gaeyhwcmkgq\/?__cf_chl_f_tk=5nVFdXPzbpriBXq_awplbBIwnZzCDLVihlWHEw_61HA-1746418790-1.0.1.1-UDeIoybGQTwLWbsb8SHQUSyzDgmCXk9rCHNc0h5mjb0",md: "bb_vid5_q7JlRLs6WmWMgmVYo8pFPtgG9lhSfB4Uhlo-1746418790-1.2.1.1-2vKJyChrUa9LAIofDN5YrhbsMiMZ5xCBTnAkVX4qYE2GQTZDzNgO.S7zmtI6YuA3.4BVT1b.47jRKA6o_3ZNholkPdbG79FriZXpxHbwWJIaG782D0Nr7G1fBNvXlbQk3UCmGZ3HiYuH1d2lLX55lpA_Y8iueUfSm3RHFCCUIXYtZLpn7C0N_wjKG0sX_aamA__EuKHEMoSYo8HXLVCXWD0ztosQqLSOEyeJoYemuikaXFwdq3._yoaHzPN8yJj9PC7X4G0yZaFFVoVbSDzzeU4FULuReN8Fm7u.jplyFddVmT82rL_gtBQxffaUfQGUd32SsW565f8F3eB.tp3cxem1ETDSPpCcUiq0APqALIY3uYKn0BPmWAFoLT.oE_cFEIJA5qXkLlqvSaZvCiuWjgyWJnuppgyEfcRsE4B8ITGegl7yFrtUmpmucwsN77dmPPSjs3cOhy5Cd4w4baR8y0jsdIDUXZq62dq8Z3JwNchmrDLnbPFEjEDdiPMrCYHhq.2a2WJki0sALbNRgPmKhgk6Itu7MOxjcPia83acLfSpJLreSk8w0ggoJP.Q6Vh7_APa6CF4A0W2LM2eHBFsy81uJL9EmZzUTe5f33GqtRFjNGaRcPX_vXXbSPUVV8xRsSqusoxf.zU43eThuVjdsMKigr__98FtMkPZb4JhvB35ZXWgs2o6JkEeMuF2Ye4KFjz8fopkaf6grh.cMOu_z_r0QWBNPlRusBlLNAzv8kqy1cM1YFBPR6JrFMgIjXfDPiQVTnCd0up4uU9FG6qb59BorZdEz9peHPQydqCYETQY3Fr4tT9Y6bkfvkOrNau6SYaHvniS2ZC5MvJX79AQremPeF.9NQG6EIWri4JwjgBwZGIT3kmmLVT.FIVw9L6pD0GDtNoKF8gAFdwMP7oXj9g1hx9sC2s0nRTDXVdFy3VriB0TIfWjmDUmy1OL4ZLAxgfP83aReWgF8DIwXpY.plvovZApNmD1uE_FSGAkdqgCDw5RyJHyKvWZsp0UyS1p",mdrd: "2RpK9uwAcLQ3qbCifRKlSRHNFP9vFy.NiNTCd8a.Wh4-1746418790-1.2.1.1-YkjX91RvBebLP5G3uSKxjn_Y7drq4TwEOAffSKaJXsGWsEniAkELpYCqXg1U.rM5Zftk0TIBUxfagpWMiRhogPLH4KQYx_qhmwtR7l6DbfxTxwn1KtLpU3WO9LeTg.U1VIf0OTsN5ClfCLov3xpFhT8wfZcC.wnwN1EZ3AiJu9uXVKGVneXlHTGVTNwq5i27tR0znWtHt5cTepMlsmqQhd6jSitStLKr_sVVML5HRnxC1lHpvNprBEkLOE8S_n44cDplZvIgh0qq5eIJ77YbWoFVcxRV8tgGdcqSmLTx.Zc6Yat8zk.NjoYAoWL9Px9Fhedj.HL9nejKFZ78wzvgofRAhFDPxoXhJzPg9RdAff0D.LMxzS7Dn2TojX6GNU_w95Orvt8LojBJZEcm6rRju7tDtPziJekCsld5sWY7UggvmsJL8NWrXNmkRLyP0kmbcD78X5JKV0K6iZRTwaHxRvxJDUGFZvdVZUZGbC5es.DlFTcT2Zjg1S5wi03pnyA11780UB6.At8RR3mslI8s60zVWkGiU6UHRv7wIYcpS1z.2GLQe8jZBDMH6i0Si3OtAxT5DdZ2ih.qc_hEJN6k7rzDdqh17CfYgmEZyAzIBpn1WLjylN0bT2CpijcjbMYOn37lHLZ3xFsPOSIYBcFAJuuSZb4diH6L42ISZK4.oVtBA.Jv8NTwMAFaDioBtruTTuvZ_UZpMzLRmIWc045yo32IdtE5nVnmvEZw5aqeOQ96vD9updHPczExgqnrxi1gY66HJiRRX0m5g1k6KLZqzXoO89I_oqy3QYrcN7jtLDJ0sBdClczdbrcz4GU0xG7pgt_pkPPzJSap_v.wbKvCgL9GmbqccBa7RAJyRML8v.rkAKuF8GH46jfRBhVWFFAHRBfG47jJDU8Ni55klwTICQfaAvHjs.w87r28iblrOzzELRG8bUeaVUlLE5_0TwapPhDK5jU3CVMw0noq7Gao_Q5SSWNs.9mvpseE.YGrqO0ln1p.JTVQq.E6scH_SrqKxLNoAnA.fDMYpOIcNoVpDC7jCuY2yFUP3GCl4EnEIWZ.z3KCGXViNpromp3RdBQoox3JPJSCTdCM.2ZkHl6AakS1iU8rHGpl8MjCmz7FifLdpSqd4u9ujTOdhzZ_KzDsOia7iuVNFMFQf5AO4OIREld2hwTmEJ.bXCQdeGy4.fmOgzdbnoVGezonwvch0qEYmiFtKK3TXk.7KuPQkSwZW0v.PNO3yAVJZu0VKcebWKO7.D9fkI0Ln7rOgkEFXWaWUXt0BXAK9HxU2JD3LOnYasn4tiDKho7CIDDBQn95tRjRDeWXFgneMaCmC0QQwEd.dnG4oJUwOPpi2yhn3bDqT1mnuj5DeJFxciQ3sffixEnj5a3_CY6T1LV8Omn_OD2oC8BgQbNWbuottpn0mfxwHPpxcvxLmpwQ3ejDV7Jk8AaxrgvsmDJRMw8KpewaPaPG70QcWGfn6Dtyv8nxDih0k619WgSVVdhgkTBmSkEfKkYWBL0a7X8cD3_Sa_G73DFW.GmlDPhOaTQvVLFAO3j8Xgu1gSZsp.J0FxXcrJhjNkvjr7J0RnqpEGTq.hD7oYrVueaaIWyvdbTYzwzvUbD2wm7bpM5urEZyk16xrdVe62dWPP4VsfUlHKff0CW7Tx.1cDuCFgMUuFV11QPYLEPX_qrCniNX1372K5OYYUz.DsR4LYT9gzaMCidnJ4AOlczbA.hj8bAAAn9Rv9Pye8mk4EE0X.HWoTe6BSjhNslCzmB3PzTgsyTa5BU6HrwaCFCXOSB39sQSsW4yDiLjXvnGVRtPD99JrjkjxAk.TZwoGA81LAxcbq.0i9VABxe7fp1J25vWX4UMrgHk6_g2ymzSAA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=93ad711e2f8f3931';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\/gaeyhwcmkgq\/?__cf_chl_rt_tk=5nVFdXPzbpriBXq_awplbBIwnZzCDLVihlWHEw_61HA-1746418790-1.0.1.1-UDeIoybGQTwLWbsb8SHQUSyzDgmCXk9rCHNc0h5mjb0" + 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