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/axlaqceum/

  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: '94a448fba8cf7411',cH: 'X0rFmXNjWJCHpKOMZeteJ.2CBha79LMps6iSbVqP5ec-1749007128-1.2.1.1-JQy98who8TpTABycghk0Ty7DvKGMv8I5xvdIzb8V1wLHxLPLj7DqYUadGB2H7W92',cUPMDTk: "\/u\/axlaqceum\/?__cf_chl_tk=VK95FJ6QKgfFS62_HkodINX89W5wjP1nJWdrnWfn5xs-1749007128-1.0.1.1-hEkUK9lma_dS3PByZtYOC9_PLf8vXUmiv_ulh.oaajg",cFPWv: 'g',cITimeS: '1749007128',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/u\/axlaqceum\/?__cf_chl_f_tk=VK95FJ6QKgfFS62_HkodINX89W5wjP1nJWdrnWfn5xs-1749007128-1.0.1.1-hEkUK9lma_dS3PByZtYOC9_PLf8vXUmiv_ulh.oaajg",md: "LNiCsEW.l3tYucjs1IqOSfIR0OkuoMTVE1NLkr_TxzA-1749007128-1.2.1.1-ZuF7tXmFJTzCfVOgnF53EAVUUfkmBb4oSRZyR_LQB_uD67fEXRHXWv.r4a8M8Jlc6EGjCRxTfLCmKThFa9xDuxBKYKtDWwcOMLQDXuz7TKyjCMCUL9yFVTvuGD38bMJwlbAyabjNzKoV1oze_Z_z4ka9lSjqaAubESK4DS9ZNNVXdslzj9tEkEwnEvrzVsYMe_PIaaaDbeC0bVRdcIp2Cl0f830vKQAoGudjP5VJfU_wRhjiqlNXcJ.yYH2rM6jbZZA7VCfxtW5mTxRdJ_d_6cUEszvCeJNNKeyA1kfGvZIn3aq7U2qougTFmm9ufAcjAJ_RwstBAtrIxGwXTxlhulqvTxegxd5uW8_bOHKMGERBRUvxJG5bZV09eUv0lmL7LlguCfYDzdh.4fl9ByOsm8QYaQE0NFGMe0sAVZriZrGzBw2hsWZB1yvK0U.nDtxS6bC9WT9NkSHNRdP7xQN3U1nOninQrKVaZRF91XXQ4LWXkBud.20R2gJOmza0PQUSLj7.yqyOJ.lBLa7pZIvEtlJrboepm8ydLWfKuiBBgBtetN8HT6ntTxKytoZi8CeQbBwQRDAiWvDsbj31lpEeuMIrpUrlLQ6_wI9mc79Ssrt27rsKpCsSiygxqjHHXiv9eYSm9nwje9tLCQeB16yaOO6v6aCZORmnWyKax0oERW7wir_jTagCkr_c_tzWBcfCTTX7n3u4Dp8JV8KyLPC2Yl0cYFvkFlyMiIiQOicy1l3MrfUQM.xOobPR8XJIE8UUyCkRtnCRxPJtuKkzgCVAvKHiupwu8.9UCYBPAuQmW5xa13MZ4woLaxys9Br1KCLpgE3jeWU.Oow7uAmmUIx96hQ7H2zmM1aS3c2iaCxBx_e6QC6wIyot8wPyEniA1gMYOk576nJVoVnsozJ.mZqFYOZGzlgpGHJ09pSsj8NiBYo",mdrd: "dEthkIZrR0YC4.v9ymuwlVRhG9fsMEoklOg0QLYsRaQ-1749007128-1.2.1.1-IHsOXazY5r.rg0POP2qkd1Lpp5Q.eNAN7fXDNjtS_XxgEgy7IY6ow5GaaV3Mi0KvO7dGyeQzhSFYy0EANvpIfgzG.4TT4uDjjfiQqSJ0CG8QBf2lYnkVM2sZYX36JUQTq30Adzc7Wl6DlsuMJv_ipEhYso1fdiRjVF.4G94GO22PyFylFPmEUHsP1eHAEkkE5TDSWKEZ0EuDiNfIe2MckuCFcoTHt2ef3KRP3Vxcu2dwDybIQ_Wz902cDVrNalA_iSDzTagCU6oMWASW9tW_kBED8B67U7ilkH1ua9Ln5KmRgO2fgwbNItGNQHMuOvFp9KhTvt0ktg615JQ9ZoNYbZj4gNmt9taXCtwG27BqjAVuSaHhHwu_fZpgx4i_COmys_lpR3239TUZQgdLvNtvZS0g0PBJhXrjzEdzhJiFaYrXJPUmZJIC17yNLxhjPXz7RGlqUB2VAj2G2dFJgrDcCmDsXPmXBVNbbMs4r3.ylvw912m9rr68jL8jB3qFtTIFnR_WnNj_Ekj9eeFCDnwJ7an87caG9QHSIj5_CJfWTX6WsF_YxAvr12A7tXfWCaXIwY92Kv2MDADsc10BGOxhaxJHC_KLoRJEFSey5C6HnswiOaZxVRqG9iPpsh95i90cWAykgqvhgCa1QWVghmIBwNbT1X7MJG0_BRluxq5c6r0690PuMCyFlai2QB3jKpESvZXMAVqSzkPrEKHLInobRY.In67K3m6GewuM3heH.Bmiu8LkZI82bYAZlEnRmGkqMVTmCRT4rFZqPu4eyTt0UKt0XIetJOtTXJ9Hohaq4i3b6UASyKh6jmeiw2JXMxTgvfetg7gW65.4Av2h9JHUlI3zImWTvvG8YHcxFbFEO1TyTuG2W24Y0bvibYFWt0DGVTICdFeeGK_XLTK5OtPhFQwsTRxVGAMzRyXvYtLre7QudA6nlN5F8XJEO4KcumgTKytret9OQuTerbC1GiOGRSSTcG512sRAA8SIg6EcctOHVyc5KF7hbvca46wgq144Hu1K1Fb9ASLxbxbchJLJUbFHdyRD_KW_EA6.18tz6bcz4E9hYSJtQ8afUX8HGy.YPiB8Anm7vqLJbl3x31DWXuyr2P1tqJRcu3GQmdJiNUSDXOmcq97atSI4OS9hlwfLrdmFjn8fyY_odnb2LDarU0apvbp0WbsOau4kDE_aAC6qHbi7pk.CVxJfZoNrS8nJUimChiEMg6blh.bgw45VP2AYncCWLIn51ZPGm6tdBZ0knF.Pc1FOZjm.8PuYwlvK3.NuMRQ4933dPa4_GPptTLGMoiLUn3TxqLjsNMESRVsGClVL1PCz5MPK8xMACJwPuDQidaxEU1R0H4KdBRfH27uLQJKIaVzP6W7NGZqEIt2RASinXeFLiRqOgjNQGBx0kvVLYRxcQqI9SfhR5Bt.w4iLrs1A0wSnQ_N8E4fmfFG_t5ji3_c4W7wbh5ETXKBlW0AsVDw5Ye.Sm7ihCSSiDlL2MgnLYbvEn_B.NWpC.fYMok1K9HeDLXSXg2RvzeCxOn_ZD3mD_j6JxiehjsBAI2B.OZMRFOSuj1iT6BE4EGtuhwLpJbAWY1ZBJih1VBsC_wgZc5BnyPN98nOK7qsXBOEcnTkELn.PfsM7Z2yBVN.vW87lh8T4IM540_qHBINhRqwkDTzNPd9M3U.ThyBBlQ4DKuE6KTx4jw7YFO4_0O_say.Efqdfh0xmHlY199jQf4BA6p9v8qluG3.D7LAd6fBIVdeiW530qR3AvhxCCyaG5kJwtCugUaQ2jqRqs94FJNkxBrZwBMLEnLIjBfUiqEB2kbj9BpNaG.pUA.9mEvS0K3QVpuL9DhW5RjvGqbUW"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=94a448fba8cf7411';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\/axlaqceum\/?__cf_chl_rt_tk=VK95FJ6QKgfFS62_HkodINX89W5wjP1nJWdrnWfn5xs-1749007128-1.0.1.1-hEkUK9lma_dS3PByZtYOC9_PLf8vXUmiv_ulh.oaajg" + 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