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/rgmrwjfsfizx/

  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: '948c028f0fc259b5',cH: 'K5KOYUIO6c8SyHiy_EPW72QYU88iRTyV4qchvStRr30-1748752586-1.2.1.1-B0zqRO6LQoQV1XTpfQok43j1gRdwwktmQQ7AswZ_MC.egqvR6zdDoMkRPozleP7.',cUPMDTk: "\/u\/rgmrwjfsfizx\/?__cf_chl_tk=xLcz4sf9xX.1NRD6gok9BHwdiF1ZJMnwg1xig6f7jrY-1748752586-1.0.1.1-KelG3bi3N2UmE0dd1NZx6RdRCFH.ZJyy6rjjeLK4TM4",cFPWv: 'g',cITimeS: '1748752586',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/u\/rgmrwjfsfizx\/?__cf_chl_f_tk=xLcz4sf9xX.1NRD6gok9BHwdiF1ZJMnwg1xig6f7jrY-1748752586-1.0.1.1-KelG3bi3N2UmE0dd1NZx6RdRCFH.ZJyy6rjjeLK4TM4",md: "JpVREfXGd65UdwCWu3ZsUqOlwBvcathfPRtfua8_pkQ-1748752586-1.2.1.1-hliJPsNva9w.KKOA3Z3miJAMYwc5f33qdF6vq2ueqQ07QNKAN.N7JMpaZ7f7wmLglT3jumHDXjkLdH6oY.fL8xfnHTGoIb_Vu9KVHmY4GZxO4KxhldiZSJXiiXo3lRwMeP0mq.84g49GHmt_9KvqkR1yAfjE44D.sOgOzDJU2cT9Y_0MX4xrBSUp45yOvowP9NZMxwCVGnYHsWIWEs45q0gA5GL5_2t3j3.SP4xiKNMZRhPgJOlM1jthWvbPj_v06tc.62fTCy5uiP582PPN7Fn4fC40tHzTlheNbedAjiuCZWjEtNpSEYh6gvt_jzF8JuEWULubT6pEsaLy1W_oLdjZq_CbD9nutQxP7GTMNR2naIp.MYYjUiA8tyJx3.4pf42W3W8z0rC.LXCdmsBPNK0eIUyyyx93_u_GJI9kqPJWDF4hjIfXQLHV0LAZ4iGUCpHdLPQRL6cdx761EjJpr1boi1f7TTYjIPw8mIJoN621BCKC_b0AoUzXOX_J8kPYRwRSQ0hc4sOG3kikeExINOW6p6R2ZzDOC9rhoU6qz3LBS1zYmWnNIRb7J_d38FIDWGiyt6fOFfd31KCw437GeoHcpEzCSwx9g7_8UfD4mToAYmEWc1S6pcIVNQRCeFxMIx.XhopzDHUGTCD.LGu03sPrQePhpD8oxoMXeK7MTOn1Hm3oz7nmmNgDKYCCszshj3.JT5yl_2WEq1RAfgSb3NDoaOGun739.lnfXUeEkz1.O4V6H8sBgpC2SW6NfD3NqXlRM4O3a3yNMUYMYkApfW504SrrTmpDJLh7xU5zoHYk1hA5RNyPkGJrW2plh6xxuJ3TOB6Oz3jHG5vfTBUGh2zFTXQvsNkN1ZXJBAGbSsZQPC81bJAgLu.u17en52cLr.6A5hRla3IQYiOVaI4wBl0Og3_FQhLOVn9rCR.DLMc",mdrd: "9IXzg8HnawaB3raa5s.84OKK1D6Nmpbclep.5Pv6xC4-1748752586-1.2.1.1-3yAWaTWir2hQx_jPWZ2s.Qs7WN.AoZyJo_45VMQFSF6s_u_hkkcRSTcAubMxpwEZpqYY1kd6S_i.h.0MPxlBlVQtJXAbx39XRY_vWdMX0ZWEicHmVQStC_br25TFOqdRqz4z9e.3udBAJukPnTqdXRRqnJLBTVyI2M.px5mAoqKoF7WobV0xQOAfj6LKOKGiwLNqnSKSlNP_qSAa4vEL9Ca6ovx8r98yp9oDJ6K_xCPw0rD2YjmTKHAsdQbKSsKiVI2_R.KpEWLncoHFeXY4700YxGJb5RgqrFjlssum9wmf6GKkkxew.kreqVzPbB5FlsIDbNGsglDubuyZaAoeoLPzEOt67mHucGESJ2F8dIL9rLhv6WeTya.hUpCQnv.n71.FXgrDJ.Bw6x.FoFRUmmUY2.4El7sFgXAtwADC6WABLSocUeNlJncEgsgSldTHiB7ypkANtrleIC7GnYztBPUE0jC.hz7sgVf2owMU6rmIVGSW1Pln3fmByvz7wPldua6ze4aaFfyOvJDThfVVVNZTSQltgp.2DgeA0yOjBEGIR4aXSyve4uhN1UsoIKcuhOc0VDqCzPj_ouLmUNj_TBxVNVuf0AjRvEAhHgyKnGAeeCVgFaCuvqwNbqLKLFMCPYHbYxyBp8vXc2NWUs7tRqvhBaxWK.nFdrsJSa8gvYCPkSyhrG8aM4F3ggUYFbI475RwVSsrasFR7ymwbUBofjpIRRo0n57h.pWpw0pSiIjll8vHMfgFDPzYJcuiEgvZE1rgwJLdWXSaI4YmtV9x9cWjIWI5Vbvkc2pPGIrAAa7LX2L4WB_Abj8hhu9qEHHk7z05LhqdghhbHT..Hb79k3a61vRo19MelUMJNwwTQFGUWDOx9YlzQ1DuUlp4ofA9lUar.ltkt_c5SQByz29_391PMFukdsXzNXeZwMurN0YQzvVJXb3PYgSDL1WEMAoCgnS7bz8b_4GqegjCPX3USZljf6yh4CgYgrEnht71Z35.GAiK5bjrCz904dYPycohMzZx.uE1UcUvHpUyoTxbwatRFWJ5cgw2UTFVUlaV0JwxjX_f.GUg5K5.pPzfLAJk8Sev0rroywE35xFOO4NIHWHUOsTYAe7PtGFuc4hh7KkCUrvEoJsHOmHUYNbMC5NAMVpLwJ8VEV3u0OLUR_hgpOg85dg4jUM.Qd2uGg5daweh9.hJ280S5LoZ7UxB2acUdmKXqpuNCBWs5L3TROkf1cIfwh1DmSDwxllvyanax_JFRgWFP8qArJGyGgyqtdpeHuJ1.iObzT8p70RRm7ezbAjn79macA4acOvrDoU7LcNp0lvvElxWr_qyW2iSmpWWM37cqRpapsBRcnR2.r_43GUl4bLOccpyWgIIAEzAIBY5UTgta4DQZCz5wWQ7a8U7_a0H4VYRZBDYmsrhf2IALN5rtoe.GqxP65p3Emz6HTMMdVMd3OqJn6nOq.tCUOY5vXa5xxXGq99Jkf0zh_YdVmfuNlx12E.V9DVoHE6lg0sWwzK1Sgb.OBRS1caDaeq_pvoSyuRgHLz6ehuKYqTmJd6LmY4Z1QjI9OVfp2_iYbLVEmWwxkePZZtZ0KvgR_Iq1OemtXpQo9IaGJ3GSIeShc_z7z.2mM1cmpfnVS1bY1kq_GAg9Z405hIVJrgti3EBixdg65Ck_w_.I63lTolHVBaND1f4i2Gc_.jMPHs8iTvqBmm_8F4_BANjc2P34gC9Tcu4g5YRY_hdaWbM2Cv9nXovHCGXGBSJIWLN1pF5XpFEUOAHoLlsy2rRbjh2LAm725rJ85PFLvCKBuTA.Z7RmzqxYw8z_sE7_JZ0a0UXp.x5y9uHOFz1BqWVAycnckCW"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=948c028f0fc259b5';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\/rgmrwjfsfizx\/?__cf_chl_rt_tk=xLcz4sf9xX.1NRD6gok9BHwdiF1ZJMnwg1xig6f7jrY-1748752586-1.0.1.1-KelG3bi3N2UmE0dd1NZx6RdRCFH.ZJyy6rjjeLK4TM4" + 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