for Atom and RSS and KML
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.
<!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;padding-left:1.5rem;max-width:60rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{line-height:2.25rem;font-size:1.5rem;font-weight:500}@media (width <= 720px){.h2{line-height:1.5rem;font-size:1.25rem}}#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: '96b0f32beba059da',cH: '83Z1TOYVnGkFkCRsJ79OaXjrdzcTGTgVG7nGqvrLAPo-1754508638-1.2.1.1-U96SBNzPLuRR478NRsf4KJ5csaDPt5HZ3ZiWwO9YZoMDknRcqCN.aIXnG.yV9bct',cUPMDTk:"\/u\/jolckpkiyd\/?__cf_chl_tk=lpZgNnqs__fWZt8v1ODOTQovxFf9ZNeo671lEdiNSBE-1754508638-1.0.1.1-7pfYAdfq_A7YsoasMmYWfe.uhVW_Vj8MQvFZwz9CAts",cFPWv: 'b',cITimeS: '1754508638',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/jolckpkiyd\/?__cf_chl_f_tk=lpZgNnqs__fWZt8v1ODOTQovxFf9ZNeo671lEdiNSBE-1754508638-1.0.1.1-7pfYAdfq_A7YsoasMmYWfe.uhVW_Vj8MQvFZwz9CAts",md: 'sEQVcgGae3cmN926GrOfWQ7p9bfuR5JgDpRg29bnyao-1754508638-1.2.1.1-MRzc2m7eaflAAmrThXLV4aKMJUoPGz_KukodTw.kuaWkBCia2.WqijagvrsSlLu383TDxKLDkoTEccOth4Hi1ZgG8hfkPMrG8MhSo25C_HpxkF6LIm_HJp442aXllorDfqmqpznDbQQL5p.tKdPXd7972HNCEz1HayFXdLgj2F0mNFj5kr2m63FevhBWNSkwlvcTNpgebvN_6ROJwaAR6DgXw.JAuhq_m7SkYwWy96Cwmg2.yXlMKDaBBeU9FFvw1WlVtIZfL1n6FfUns8k.bzlgN3q2qVA2oP2mZzVEFwl.2KffyXyADjWp5sdCPZs0cRgCG1wA2zHFvZCz2_zWBh4qUvBJM.dJ_U6CTDbpLigUV5mpKt5Vuc_JfkIFvDVYhE5srIi2Ct.juOAUpSlZfa4R4gUl1sA7Ld..sixDf1Zms.UVbjSmbDZ4xSQmIxzLloNF27gxKglfrMxAgPD2Jt7kkpIFZ_qwGYY7SSsOMzWzUNTT4pmxVAHDWC83i4YaXNZ2.qMjRkEXVRb52FQuuEn7pajphRz7J8IiChBskRv0gHH3J1aLENH_9WSAP3_OlXQe7hqWLRfV.GGtnYWVPNMIxV5b20znrEp9e_opJilTDQUHEntroxephn9Q3NhapiYdYwGz9gSN8.NGuQjdZ.KuPmAvlGfY9HBfWIZyROpUlUVK.4ZG90tzsZBgJe.e1nM_qibtP.QQnqLqxlE2Ovrcuh4Vi.eM3qU5r83IawsmNsGzgEkJ_Ka1SeLEnSxz0N.V0Qh3JFh_OsZhr5NyMjXt6wpywqbXRYlyqILPIl5DEzIprqFvTPRJP8v7X5CBIhim4GUiAtoZUwXDRO2uqL0U5oH9OKzv1zj.eUOgwvBUouGCVzVQYDkA1HLs7RKpDKTAnzW8wdvCDs_UqKPds18OFK7wa5M3iOhyZkgx78Q',mdrd: '9ygB2otQIHxCk1.CbDVc8WxJorwU8KOxsVfYrRHJdAM-1754508638-1.2.1.1-EJ633MLblNLV1z0fgkXq5eqUsLPemXflPR7GaOep7jLUJR28Uz_HAvcpRBoU3m3fepsbvbDBjDS0MDO1PR3bvw22D2Kun11ClB_XRbqUgiqUn2LF4Gfa9mls0lvTdFDu9F0hrM0K.fH8uRjnULeR_hn9pZe6f9EDG0AOH6q3i6VzOskHkoUW52OEi7ylGlFTDt53YiHixdB4soDKP11ly3m0lQdFyoh3WZUWWQhWvEGzc6Wq57NWU9sWMUHYQvlLg4vOvLYvbgQED5qqeElguw29YZfcUEDO3xFOUp1..8UL._1o.hcJAS.eAk5IyaAK87r2tyqXcwqCMYbOw7xJIv7rhzfvCTemT2PfiLGIVsyAm1q2kX1Pw7sPJ7dxIf8N68oNUzLtBeiIIsuXDvbllRuuASkU43QXNtE9nMBLpaGeakBJuli9gc014PuTxDYp9066SLeveJ2esHR7hcJIPfBel8qUcK3cOYQnB9Q8zSjvgejakfzl_HbqAb.EO.MtH1CZIyZQiqprcQ0IKbAUDY9ebnK34pZ76NPoQDl0YygFHFdYWwsnIQo.Tnhn3hUiVD.hp1AFUIykeNN1rynAVRbNvXN2RhIU21i39jV8vm6xPUnKB5mlsVUyP.ej334TzGXTCEcAwFfczGPvVAnqpC.fk0dYJbS7TLgEaliBmeZpddkCXYTlwwO8796BuikIU6h0.3riAYJw4Z2B72gAZJuO5zmK0Dr2LiEhxWQ6SxFRPGwEJy1dhaCb0isEydk1jmzyb09vXoAb9TLWVMrihiTyXWS_PPv1ebQYQehVSJmswewkHMqNhLRlKViHflyOzIlg2t8PlUw0C_rjb81xNf3DpRyJGVzxbRvk1jF3L8rKwB3mXKY6CQWDha2pbE.oqFGTo7y6rtbHY9gBDY2zAD32WhPlCcGp7JJWNYTxggU0M5PaS88Kk7cRmWL2zHG_DfSiFlrUBHawbvwqg3BihrGsc5bPTkX6Q2s.nJsJmDi8rAq5rxQziiFSVrGZLwNuAst_foHL83xUNraKUYBgoZYQH36SsctqvRa2N_T_s_j1VG_jB13KYFXhw_nlrdSA8noNHthNo4azmMsD4zWn_7opjra05rPX8kL.DiA32437XODWv_HgRV7pqELj3ykoJzMAdLYH8Hv4Oyszezz1tH8HKNmw.1J2ZrTu38vgl94Pu7k2nLLdKjuOejcwW2r2YeMm80r4iafoZZIvSJmVx3pQHou2veGwZjDrFJ6hWQY9z3NhRE5v6yx1gnfN30myx25RebQYdIsj8m06O1z6MGti6k_qyBqhh7qBmY3AYLqlUIvl3vvKNMwpl3ltd7iCIfTpShTQRttI25sTQa_GjdwfOk196lQH7_U9aZd5UKKECqcMUW1gWDtx.GYvMbcNNzDMh78sUXaUAtySQiMFIfrXCjAusxtRr7p4JYDKZ4NWDU.ggtU_gGawxrdooZoVV5OIAx7Wa77vS77ksKsQRiYLXZT5xTlBBNEzqpGB9BKA4LGyzmBiaccSYrVWhzZQrx5ith3q3RqK9bJZo0i6YHYQPFR7NX4mEIXNdxoznk2V406SHNGKlJ47i8f7mq9r0mmiMndtQ8w0EmxOqCm979ZTDKNfi8V7Xu7XuRDRRJy4jrkcmKu1Q0efDK7onVi2mF7ooDLK85nCEBfzxt_HuHcYA0CXYawBovw6bFHVi7Gw3PT1NgN5vox6I_r9Mcb1OyVKYcrAhGVrZW6AqrcEBS9m75sN0m4XpqgEnGr.Su6vgYragNbq_J3IMmsBds1DJjQtULRVqebS4alEFAM6MyfRl6D6ZZxeZsZtsk0i8LPzKkK3d.ABzY35H8ATOu6oGFqB_caVOKdm8x571UYhWQ',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96b0f32beba059da';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\/jolckpkiyd\/?__cf_chl_rt_tk=lpZgNnqs__fWZt8v1ODOTQovxFf9ZNeo671lEdiNSBE-1754508638-1.0.1.1-7pfYAdfq_A7YsoasMmYWfe.uhVW_Vj8MQvFZwz9CAts"+ window._cf_chl_opt.cOgUHash);a.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(a);}());</script></body></html>
Home · About · News · Docs · Terms