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/ltzvqxywz/

  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: '93abf53c5fdd3b38',cH: 'AqGXemZKMpkqAFlAuV0CIim0XZjNeEcn86ygtYpj5WI-1746403230-1.2.1.1-EuWjdkTu9yp_beEpXY.B1htfbv72aGhTf2hisA8yXxOXW.sUtNdEppuu5uFXzIiZ',cUPMDTk: "\/u\/ltzvqxywz\/?__cf_chl_tk=UNrJuO8V0qNtrxLspH6oev4LkZN9EOZXSbqR3Xjb41U-1746403230-1.0.1.1-ZmbwBxIeMq1jFhnIDa_U8t0Udb7FqY8KOutFEKaYYVI",cFPWv: 'g',cITimeS: '1746403230',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/u\/ltzvqxywz\/?__cf_chl_f_tk=UNrJuO8V0qNtrxLspH6oev4LkZN9EOZXSbqR3Xjb41U-1746403230-1.0.1.1-ZmbwBxIeMq1jFhnIDa_U8t0Udb7FqY8KOutFEKaYYVI",md: "h5BM6hgkQWedJyHZvGfJM7kPV3A_d5IIF_O7FXZBWG8-1746403230-1.2.1.1-rfY9DT4QuX3ehzNEqBOOjEI2AkDGYHtlzo5oQshq8faAV8r0GJYKACkHjucKtZ2OMBFMdBfDOZw7ljsQaK_CrkVD9I_ovXkx5IJIbC2RmXYuPRRu5DQvuH1UlDTY6oP8t8p4tiPJg6SNcIjrRarOYrbfSjgW_CUdLmBAWhb17I3Lw8YytFI2MzPNU85SEA.dOCnxc5b1sDLBoRRmsz5lmD6nEhrll.TYqZbQw66htObLKZf05nhsZwaVt2G9DY82T4YmM8T91SfaWz79sWPaw1KVfbSyoCkQGJ3L5dFoXyrRVKnLqimp7xhnX8fuxvZnjRjiIOjaQIJ9pbrjBM9HuVmxZjb72DH.L8IQw.vyWaxDhRDEiw3b1ssa0SAdzbHrQj8atvdr2YAi3rjinlgzGGzo1Nw4WAN3iVbcR2CfbICdvR_YcPgsJgsEV5uZVOESURZk7LxrXoBAp.lqCxOZ5S4ZF5hLMpsM5G4AiDQhqQf9GB6rQUAwif.T6UUXgqbPWzaZ.MOxIDbIHT7NCtaxJseHmC_MJIwXrk..V1hnDqdGzl_vm_4aDBaVSxjRObe68.JjtqI_sQwwIUgdQzFV8phN6jJIivZOWwyTJPD4CjeSNb3RP26VKGWJK6eHpt9ZNX5Up0qET7w3DODFvLwvXLRMmO_NEF7GnOxzGQVB3ad6cqNKHKF7qHZ14VHCxsk8X.1iTMj3K23cVg.0uOQnjXDMsFyPA7ZLjLQn3NbzfkAmK3jGu96fD9_.hWwydknx3ycncKtA9UBV5x6zdmUaf1GROSr_r6cC0CdIR_VjlsI13hq9c2DIRN6LuMiB3Ayz2LAk2ZxMCWV9JtibTSaflm5hirulsicJD8Ocx9UcffVNDsY32EtIElIxDAUpr1mJz6.S5Zv0p2mgWVspCDdlJWql8n0_HG1PlsIQ8Xax7Uxvw2pGEY7stziZ4UNrMMSTT6YrUw6Mi1a5AbaiX_L_4stspj8e66b4PLzHL8lldwPsKwu9VQYZBFOkFHN6sSTC",mdrd: "mcVjubVTDaq1B2dnxhaLmaUmxrnfXCR2M3vLoP7fQ9E-1746403230-1.2.1.1-ePUb6r2W0Rcsnfh4pkHM9bA5lf_OQwVE0QDwhphYiTyWq77Jido3jxuASsdtCQeIkSX9Iz21B2dYX0KWOybZij3XOGvcv3yjrByKpFo5jgTGC5ym.rVSxfhekwPm1uwCMmIji7JmiH1HrAauIaRoCKCh0lC5f_iRSScUHZmGDemUBoczOfA81ObUQ8N8p9gVzj0gQ7v_WtEs6z3.tQvkKBXU3ls2PA_SqtK5MyzkCglqaYeD1nmqbFbJTUFg.._h5Nz78n1rTvNYSUl0on4oSJ0fzQ2b50EyrfKqx2h2w0pVPelu6O9jHjndAFb.8aI9srvYchB7yZf6CM9NKWjOEdsT9ILTsoqyvsR1aHqTQEKZFZvRD44FcR63K9PEetesiU0YwyEAH0PT2ySh.8qiIfDpDCoLpFyiOOwQOdDqQqpSII4K2fQ5Auxy2pxw7ooQIYX8ocd3cUGakL2t1MvNWg0tnpBX1qSGfw4GmRYhky_qbVFWUTaO1w5AMW0xeePGx_TCcjYzE_y.CrO1eVZST4fGg9mC8AgfEc2dfyjO39zq4r5XXglbcVrWu_VkCA75kcATFg3KTeqaOS.oz6xgjQoGDZBvIF8XRn5mJJp_TT9sjXgoaj7fLoFcbExfawp0ptQc2I.CSy3dSV2w4ZODQvk4d4Dce6xq_Xn9Npt2xora9YuRd8Y5mueGJz9Z1mVZJJ5vguz8ol1ev_I.JhPQ_lRO3phSCd3Gqb8uvn9K6tZA_MHR6REjs_YpM6mCl0meufrFNsHy7WNbA4UadwzhRkW9pvc5KlRhBr4DvKfKNtNdBOD5W3EyLEDggpbTQLORu61KXR8GCDrUTlN9dB4MQ42OkNIPYK3.4m.ZKDdiSZSk4faoa6o47A2s2DkpVywSHNAwKPlpVK6pSoj5WW500l7SAxMOMw1y63Mx39dDdteC9D_UVbkWcOJKrQhMfFiRH2jnLfVKJEF44e4lzUdg4jSi5PcH_01NS4tse4LwncI6GlOf.XBl_tdEEg4jBqgsE83EvpO54vvPO9sK8Xej_93rlmMvfzXVwDTgs3IDPJU_H0dTjZFRxlVzB3LzbNmscLDB1RIad4GAbN81Jbt1.zF1yuzNLN5mgwHgxlIGgipV.J51ysEPw7Mz3gdX0pq0Z7rq1WWUg_bZ_o7_Xe4K4CPjC7omrVLWnk1Aiipg9fDfyn9cmsl_BXyZVmnI9_7TGtdxhPZ7qbOPFjG.6N9csmnCxZMEerMySuevaZ9ku3zKWbvAtIPdHgQoXbTjJ4bk3wo581LbAJm2lMHHNj578XTwsGxXX50A9uPJdEqK3Jb.9iLGyJ9ElkcpEL7.dR7pHFZK0RrqIMn1EN.z_e6vbRjhMaQiLh8MeRTagrKR5s3v8JgUAl7IyPgoe.oD5Q_2k_Y3DeijNlkruKoD6JoRunkgW1nIlpmCwOURPjs8DgsddLtlk8Wx2d2Q2D6C4nT3YtI1f55miGoMxj8cH99sZnQbUjEm74QJc7Q59OXM3NNfOBJ_lalwivWktuQRruMNhToCSWyGN5drjsGJLY2WkWbaZYGxBwug5DldzYdNJrWTNdY3O1xYV9xY09E1grEETM3mSBmmsv1RyoDpc1nytzqTpBQOWR0.F62088IjpJ9hhv7mwMJ9xhxlSEF.xxEI6PsWjEP8GeZBHOvlf7epGCCIwW8tW09yqBDCrxyICgv5pkS4X_zTCtSGUIxNCdYupvoKpRaf6dldb5JLEI0ZZ_mdk61DPuJKOios7570cH8xKlgRPBWhiKx3DpN8WEoO3d1BP5_VcfcLGt9PIDjxXyKvQrhPAi1jYJWcvd0TjPWKhP3AwrSwsmJkDZ8EbP7G"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=93abf53c5fdd3b38';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\/ltzvqxywz\/?__cf_chl_rt_tk=UNrJuO8V0qNtrxLspH6oev4LkZN9EOZXSbqR3Xjb41U-1746403230-1.0.1.1-ZmbwBxIeMq1jFhnIDa_U8t0Udb7FqY8KOutFEKaYYVI" + 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