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/nikgjdinr/

  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 class="no-js"><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: '931232a69a46c987',cH: 'A9HmzlPdGcMl1eRVQBN3KvEI2l5BKdeDl7Jn7Mph.L4-1744790938-1.2.1.1-2W2PLz.BjQtxe.2gQrw12U.J2lmmnSJka_lEu6l7SVBnViqMxl0BCLHHJ5ekq_GT',cUPMDTk: "\/u\/nikgjdinr\/?__cf_chl_tk=F9ock7PrNhNZzykaPMvFF5fk9TQLZXtFK.KWP2F8hmQ-1744790938-1.0.1.1-fMimG.u_RNOzkxdXN3PQAH3vCAFntNEJsK_o7ZLQ7go",cFPWv: 'g',cITimeS: '1744790938',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/u\/nikgjdinr\/?__cf_chl_f_tk=F9ock7PrNhNZzykaPMvFF5fk9TQLZXtFK.KWP2F8hmQ-1744790938-1.0.1.1-fMimG.u_RNOzkxdXN3PQAH3vCAFntNEJsK_o7ZLQ7go",md: "OI_.8keNQkoExuQM7EzSGy7VnpdSuT_LaRFD0M.jxU4-1744790938-1.2.1.1-dwHFRYkEqz6mtEj6d3ofIUpsYNreNbNSJvd9LbNWS4RmamUV_EB5eHDfM7VyexIOl.OWgBqD.AlRZoY4oEPnQJRdy7g5kupgQn8jMWg1_XMMwTbTncqzChaj_hbujfn9jjTzADEkUGqC8iaZu4DXfQLEDWJtCjeNnpcaYiex2nZf_jA6okhgV_M0xVSDv.rWNxZiTkIs2x1Z1CUT2NawfMyAUOW53lTlazxyrINK3XqG7sg8sJk8hIsjD55Fthqcgg3aRJu6DO2HqDfWoGKLb9GP9je38sjeNV5bZLDouhhsrRZVZkPis.MIJL4wsZzo2dQwPYHxjTH1n_1l_M31N3opV7wz8S5piNCcF9MYati_ggIRcSgCg.9_zwnBVmcfhopTZeBTrwMwMoD7Lp4GAFYppizrcWChygnonbNJ13QvL_mOUMb0sdm9GXS_CrKFIZD8tWDz.vDzNz_2RTE4eVCvnojpw1cC7yAFoBrAWeqyf0qqoGcFjYuOHVUbbbDBBOggS7SsGSjemff8BrKLd2AmKlOfAVF56D4CYrcMKBvQOGx8sUvbnu8dm7T2Q8GToJUedQl7ll01Ex3aFIAMbuxCwiL_xxdfDtYnd0tTVq3NIkD1gB_JeOFjjCS2shMObaxDfl0v3638A109p5aZeoeUbDX2rm8oeSls5ldux9ZLY3_Vu9T6pl4.VtQ4butdArkh47oJFUDjc9jGagy6Hp5GmRGv2OPlwmZPq.zkZxiqyCHMklLeilIpKy5TwRlaa08FkwOdrHbwg.bfuhctk7NXVJzJ5kst.Tj99Ie2lKMy9Y_9y58sY8koZv5iocg8Ln55SV0auPnrk2AgfFWUUTmGoACK2CycQV_0fkOcYAd0pkii5GeRO59xxXh_Q8.JwxcOPWBXWiZrgx1g.itrjml8YKu0aVVA_PjFFlB.Mm6F.ZcvviVGI0ZBmvhe1DqvTwZT2ueBUtuXUSSe6gx.omnWVePQYwFhR6mYdRqDvUVc2fWg.oU8G.NvQcN8ClX_",mdrd: "fQZOH5Zh5TQ7Hy1hXr1Abr39Nzbe8TF93EnvDV_El3s-1744790938-1.2.1.1-MAVwizYffYuU7V0hCbAnQMsXeqbu7A3lOL5C7Xm8M0wihQhKcF_NSJOSrb3CNSL0yMrfW8rSMVfqnW4vFlpknwQDWlernQPhnor7aSnmNZKon1uhmUQj6kw2Mg.qY.IjebowbfDsi2tzyK0HuL_lOVnF1HEV7Y4sH9hQSaxt2jGEl2qYZjtiTBBynFk0YXGZWbOywgXLX7HkMAj8RO_MfB9b9XjJqQUMe05Rqb2eQLMjOyns1wdDR5t5t8xo6jm0EcD0N.tgKIf_a68cZDGuXH9Ug_XPjJL8snG7aT_Enokrv1eeC7fbXcX9FL1EGnqHpKUFxyYYm36_d4H2MfZboH02ECpHKeS4QM8kMmI.frKyO9Qnrb73sgAYAcmUrc_1xAb88D.uuqmUqnAHjorZIKFDnu9uGid4uqa_4eHD7mt4bvtJKZDx2BFHtSxa0bRmDw92460Uc5derL1Nh.R7SVT_43P_T4UcSVPUHg7QrF8TSv2rxPMsyvuHUkUOlon1b6ZGJPxxbmYafFepwZ_ARrGRyqMJhmEOli.zAe2qzAVYnTvfSU9tunZIKrMCPbLjIc6DPAj4J0gcJAAbA5J3HyAJdsHaNaHJJCfsowfUZ8RGtVhOLS41zy5n2LZtLP_7FhH88nUK5jR9g0XNaOkPFnmWxILT3Nv8Zk76Vb8xGLCVLsvia7KRE9H5pzAr7nTj_ADSUFaa3ySTZgMf9Z3ytar._q75SYrBDKNglHSoZa4TITGaQcF0Y3DNIseCYEqBWXJEHP3zPRTT05hq34Oaip_DdeWw31asI.TDsHaDyKDYx0TSiG281_zKsRPmms9eqvD8eaQ2A8a75CVL9qeUFxttZi7CfaR5ylEV6dLPnXK0ikm2..F4OJVx7w3UVvGORQw1VYa24PxPVuioosd6eoNYgkNhY0a5qg_Q4ZzDE7XbzQNOSbaQAFCjiPf14Kl4beG97jubbCQ9e1_mKUTCIphHIZ9oKxnmfA7GOI2hNSBk6Fffy1WRQpmfBBD.le8vH4VCpT1QPgy7w4L7RZ9e.wNm9aOZW16yW13c4_nomAck6l1fPIf_tWeukjFRoMvXwJbmgDwUowxUSD7jvlq664FIgFXrBAgwajy09gKBm4CgpZOQonUcCgF_7h4NGlZyMG9qZFXcQHW0JXvRzJShg0xHEL5o5rQbZcPk9npP8tm19vpEnWIaNNG43So83rH9mUyuJriEW2E1adjAQYnB7tx4L2kh5WA6Y5EqPWJ6hnBltcLeU.pjyFXKNVKiwXQf_eqdW6CL9VfaQV5aZjJSttBKD33TCOAcCr1SSbOPlGiTvhyhSpvCbbEhYc3IMWfHOuH8zejSKcZK_A6I_JycqsWD7xK.bADyqn6yJ._Ndtm7cSts2ZeTh2TDQa77ESfVqrFppUL53BID_9bzZDkRonXCFn_B8Z1KAlgHsd1B71ioX6iCRqx6uY2POvFRAIxuVy2F0MrKr0RBJhtRD.Vwe3IhXI26qjbtAiFuGE0dHTG9.WqpyiBFTcyt6vwao1kWA7_QmJs0gOyAmVRsrjYCOlk9DyK.I356Ux08_W70nMjIosHWBo7RR.naC07BWRS8LzjvZAZktRRitnfL8ay2RBREEfLuwadt6qXP5F..rzhunoGsRJRfjzJ9ADFBx1emF0UyKvofPrA6NFkfCwTEIP.fmpHIZc_6eupleB7uzmHg.PQo_Uma8MzYpoPlnmVGrRnX6.J2glyFv_w8HMWKVwoh_mkSUHSFVJ81sVQK3RkTtD1RHr5IsMaoSBfz.ZGBKP79NG5ZtYq6vc0kLuxsBNw3senK66gaC50Vl3GLv3R84A0N.x2oc.gIc1DiBWv2L0p.qBG77jAu7zcSmm6rUw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=931232a69a46c987';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\/nikgjdinr\/?__cf_chl_rt_tk=F9ock7PrNhNZzykaPMvFF5fk9TQLZXtFK.KWP2F8hmQ-1744790938-1.0.1.1-fMimG.u_RNOzkxdXN3PQAH3vCAFntNEJsK_o7ZLQ7go" + 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