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/qnciksieul/

  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: '93232b374a6dc9b8',cH: 'INv_kZzfg2v4nKsdVmXt6Bx2lSmCLpxQj8oxZOLumPk-1744968892-1.2.1.1-6ktARYoM4McBr7KPF9c7XJkD1UQ1UEdaoiu5xrPcKrhqpp2mfLa8GQRGOU5bfu_I',cUPMDTk: "\/u\/qnciksieul\/?__cf_chl_tk=bIcnpSCL2neJunWPzNYatf5JybHhrboNIQJFUMOgc18-1744968892-1.0.1.1-MnQASJh1rIAnhjTEN19LDoHGzpEq5tdm.8c3ZRF3Q.k",cFPWv: 'g',cITimeS: '1744968892',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/u\/qnciksieul\/?__cf_chl_f_tk=bIcnpSCL2neJunWPzNYatf5JybHhrboNIQJFUMOgc18-1744968892-1.0.1.1-MnQASJh1rIAnhjTEN19LDoHGzpEq5tdm.8c3ZRF3Q.k",md: "t4v0f6nSJc3n3RV4pFNFtymIL4cWyrDEQYt45oA.aPQ-1744968892-1.2.1.1-FSuGe11isQlHNASGnSn0P6nDupp_tNqxvhCRJtTeKXwKXfisFQKoIE.O6CLhTGDeJl4zGYQFmFZlE1jHUEMzmwldwMg_SuB.6gpWm434Bi6.xSLDkdO6EUIDIPZoOh6uGJXHtkOlMJ2KvgE_MsAVkd.6IJbmhGONCV.sTBi26.4CzzR3cRxH3j4.h8WLZjeZN_nqjyLSVNB3De8fAaDt6wld7CTxWs2.SMrC6KBXW1lDNIfieaIMlrZ0kkgy3AtYWftS3JBn5ofSFwZ1g6uv09ouPcfocwaaQJbEtnSYcxIj_st.Axq3.awFfxE6qGhdyRO0RDU50aLRxLV4oRWuJ.jide0Zf2IGKQqHbAUmaFhdviimT6REqvxeXWHOxXHvYcYJA6_wKNtiEyABOJuNDc8aTbS.bz6VpohqPjcPcfg2Tzoj7LUIFb.ypfWYCKWeNWDOS9oN_BmV3MnnDT4VyJU8RBeczINg6IifDsstT6zidkuhUZSr3SaLx2Y3FqXsLTV5TCTqQ2t4MHQ6SdIGj6bxzgb6wjdWVVcpV4WfWm0Vt60nOKUXajzU4udT_EyzjjNJSLqqJ9Mb72SzEi0kVu_tN1bZYPsMvGPW0Jg93YUhAZuqG3khb6NiExhv1LpEYPaCcibdiueWfS9w9J0HhV7PzFe162isxRbv7ZmHoLVgK_NhFQyvQIr8PY83MoWzytvjyFBBZi1QSRkg28qtnq9NviyAKK6p0UkbOgSABDFu1VfAzI24fJnyG.T4yAgJ97pYBui28GVjxLpC_xWZgYzYKVGR1P0LvF1AJ9Fk7.mICY2KSejWWhMQfrUcBd6D0sfwMo98FOf7.CYetRxbmCUlYyD4u8.ZGM5Bh77B3UVwk4eY6AR75U.wP9KIv1ymvQ3JlLCLcMe3TMTFK5tGuBB6EnNwz_YvL1o8Rhn6MUmCvbfDsl.Y.xpfE2dqeQhRCrLWZcUYGxEumrAbk_xRAoZixo85e6bTJa7NqPbw3ys",mdrd: "PIhEoVKYuEFBjdP.fq5wJOW7otPEtyz6R2lgL.P1p08-1744968892-1.2.1.1-d_p4xnFWIVsPSW_0eEP4yj0JMMFmUoKhGd7XJLjgC1Cl86Qugx6pWB6Al4uwd6FbewMXt2kPUSJhKRYIqcBtw6uB6_KcESzoCLKHLsNo8uV5adefcfSnCRcqWZXQUcbFi_caAtmSm_94Whzj0ZXIhbBank0QV0n1.cUGMYpqzugHL2QHMN5jSS03kTuUqEMnczAdMLXnTUYbAejd0eyqpPsbqf_dsGBBw79D_Kf_JWIdkWWBush45Q7wNClT5j_mX_n57RfagiUYs5WsydW2Wk7RmkRU0vzgL5hmmBUpisgkvGj5JF7OHD6mG88IVwfIbfHLKksFOY_dQJ9BYfQn1A_zxAfGnDpyqBZrGY4xXPM9S65xdti2YJlMxyNYC96K.O.s9ApfLqOFiEE99U.VGkXX1f0y99.qXCrdCynuEV20sYgduoPkPQ2pPHCcAKwvf8Il9jgXZQlHVYaxWPEVL2ixQ.9xOHQlTp0baU1EcJ7cigbfjzmum2SQZurBkfLlhKICjCxCg_lalBPqY30J3bzRS5GUdLDWHwt25J446RPmN3SQ1LvMilXdNpVe2.BkImnKeI7X24jCsZmHNANXMa.KZLQHO0nSqjwvDsgnbnLjmXCxh4j2kUM5ffCdyEIcbbcpAJPVn8a1YS6XXnex4NqNqxhh1MMUUDzWvqVyqvDBfWwTlk6AsFccm_98FKHVoQY.0_KkF14x_sC61jyXYtVGvLCgGev3tup3b9be4dW999W2rrXOUtfl5lbE_pKuxizMB9qIlZBFbGmRSeWVddbjqF9wUp5L1IOws7EpeucH0Dk6amSNqyJIVgxl8QzHw0OtUvoTyNoP_xd95bBDI7IFBvtR7VTrJmklifGuwmkcuDVm73fn4JbuyA1Ij5ZIHzhte5LDQUnbJ_afZsIcru6YXSO6v.._NffCXdtzqFSjSmwgXeuvRyDTnn0JVjX4SdkiZh9U_S6s60DZDtt5qqW_WwIcRjVUBXYcNftTmRCA2Ko_Y04Z36FLhybOdNK5xEqSN24fYGGr49uJeO9LKxmAdlSmIfCtSi6rS_.UVbBT0bJEfWoT6P5nv_FkH7.xr0yu6LN1.cAUnIjbvw.aNmqULzK4yE3oxvRO_169xqy6cJskD_PbdyOyTsdoGz.2ADNQUfnMkIRjXPfybqlnvVpH7SQT9U0HWltMtyCJTv1nRdLe0BUdEp3PBL2r9EGmrEpy_usCHULaJBIi31.34jJEGdvMkylwgCROsFKhOcumahD41GDkzVz.gTUj41zQbhQdRMJOIiC1zROet8vXjKdWsMN3fjeRYjOX27GNK01g1_Ox9H8886Oq8b_PpsEJdE5rqZ.L_0KuUy4WLjswUvn1r74LkZdHNYNiS0hKmotAxLHzFkV81_mEtLWW.JAuukT6CW.iFf2dDfDw72L.P3hSHPb1wfBRvQUJiKvq7blpKiV1BtDd3NOVBS2uS_rZGXm3ebAVnT12gcQ7Z847Hq2iSmay3Q4lJ_l78Tfd47GqjgUR0nY2JKwU8RpFtlKbugns.n0FKPRbaG5bZMWk53SVOr2f93ISGMsrmsEMalS6VHytFcD83bDJlwJUMpCH9JWrOzRLUGGe4kZt5tcAYj46PI4uxttQ9e8XQbnUF6fgyvLpnyu3c3_jBPUjl3aD4pFoHi71pkxNvNJnw2RWut7aav8OK_cKEsf9zEA4Gj35T2T1w6HRnnfsVGKh5nJWKotLeFZ.4CYj821szaOUck4h3NnT01Hglfk86SWcgs2SiVl1X4KwBZuRWW_Tjqw21FDkJzAd9BKE_qDF65CfR7xbJ9g1U7WDUx9d5sjrRSeIm6PEsIEoUe7ZB0Lx5XyhAXeGiwvOxpJVXuwdi5Z_Pw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=93232b374a6dc9b8';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\/qnciksieul\/?__cf_chl_rt_tk=bIcnpSCL2neJunWPzNYatf5JybHhrboNIQJFUMOgc18-1744968892-1.0.1.1-MnQASJh1rIAnhjTEN19LDoHGzpEq5tdm.8c3ZRF3Q.k" + 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