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: '96b0e4618b1ac58d',cH: 'qlkem_bGk7x1xlic1dAMg4g_2KJGDYBgN7ASA3GI8Ms-1754508032-1.2.1.1-YAGS3_RV83vpx375sWX5NucoWDrSnK6HdTn7hDO0Aazq806MDFUoCvlotgLysYVR',cUPMDTk:"\/u\/oisqmzyvly\/?__cf_chl_tk=E3g8IgsrHi9dkprPwnqQ0Clq8p7icsHT5IClEpu0haM-1754508032-1.0.1.1-1J57SHrmCT9o5x5f5ZtV99T2Q8RFTotKqNOBRHpUJGQ",cFPWv: 'b',cITimeS: '1754508032',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/oisqmzyvly\/?__cf_chl_f_tk=E3g8IgsrHi9dkprPwnqQ0Clq8p7icsHT5IClEpu0haM-1754508032-1.0.1.1-1J57SHrmCT9o5x5f5ZtV99T2Q8RFTotKqNOBRHpUJGQ",md: '6FF3S1lEaRrQ8_vDE7Gn0cDfwvnGBm1aGKw4t.EC74E-1754508032-1.2.1.1-CoVFTCBQ4chlFcym_JpBOOXYGASvkn6WnFDhq68FnHCe6pXdTQ1NFvS9NZhTB1.UDir.MOmXSPEHEvNKvv20wCBoPOIzUNWnYNOezPDwIxJevrYMAyrX8GotbQC2nF9aGo6wvjN583I.MzshznBysvMd5kFQ.f09PsaEMGSmtz5FEC5TrRU83XTofG3N_ARZ3gvJwVnA2CUFO.0BquQNIiQ8dUEIk7PlSb2JbYsST7WQw.g8foNwfpJmaRLbHv8eAkLrlSF1Ff8vWAljDvtUjM_zF5O9d7i0EFmcSE_ukmuK8JyShcukR_ry0zX4FDnq0esI82pShV1.sx2Qzg0LjAGp8kZJmvrky5xTX1ckdQfMnsvk13ANsXplbWeHSQmLzn8atyOpG3XpxG7N9XWbrpi2WAAzmdbGnOOCciKV549QEmOYJ9Dvy9C8dHsq8ysr8ZDTA7HwDVnPzOOVyj51XbGsj21zSLhLRTCgT.VOw2nZ.jf4TVvZrwLnX1CqwhacTGoRyF9YqmnFl1nuNI5sgl4Mg649FXNobB9qLZVWV0rANgT_N7N6Q8nvlwzdnMnfunILYC4dpOnRBFhMQ1wnb5FIBhRyaAiZl8MtCeh1.Zt0_Jh_SLmURH5IpncW3cCHJ7fhbYtiABtSauLIF.oINLgKtzUqaEpmfEapTncu0AFE_aVZdI8nkctHvFg3Ne2lLdjwxWUhHMX5D8Rj0.viIAwMvLD1deYwyQ1bkCMwNgtmlH4GF3WTBlU2b7LIe.qLt0OlYDfnI0vHLxEKlvsceslTH39aU_bNio7XBMASKPV3pKLbrSQjkzhPRGkUxM1kh1b7f31G0yogq3NpvxCAG.59T7C8w5QWMGPHkjBjZz3BUAKPjZaGE9loX5.fHe0ePyBGhF2FIaD_xMX6zzASTUCIl6HA9_Sj3B1Zsv50NR8',mdrd: 'klrB4VjKmJEBvq0fyvunmHAvL8QtXyPO7aIE45Q0iWA-1754508032-1.2.1.1-PtZNphC4VuU4FYCnLjrwjxud1Helsd9Da1ILnScKx8kx.RtixCceFBx1JgSEuni_h7EnnxxKLA7bV2JFhve4o17LEYL81ts0WG3UVHuhl4ra45JozHomYyzb6nOwbOSz.rCbx2ItcUTqSTja883QjGq2C6Dk6pRGdFHL083YVX4zHE10K2ldXI1jclWdR2eBE_PmaKw7RYfHc0Vt8n9DOBHSG.xe5zUDGXnctnmLbCJWaLRUmcno4OPqbWi9N_6QbXf9nfLrhG.86ol69Iu4ELyYvUJQ5_veZItOe8.1zCy4rZAGwZ8Dbz8XgcQOHpxGmZIMCn1upBoj6EP.Liv8Vrc9d66ERSDeFy3nVhAogIR.5Dq..lU4GyzipMfKEmU9br_ahAUMEkGSp5KjK2K_MT8R8GjgSxFysN.BzAUdw7iQLdwK9FHyFcRZIA4K.PYxaByZWtVqPGqO3ZzwxYELELh3vnvyXlQMrrUTdapw_wLe._bBNYQQcchBH8To3_QiUsKlzEgv4Fa6IdD8bF00avA7xzr2d7JU8E0sFoQdZZO7Nrj.R16OcAcedCX5a8P7u4w9NABkC90gQFvERVJQgItYHPwyFXNnarYaTCAOd1czalWiuljQxtV972z9wHfZhoBD7XyrXvGrT.AMGeGNGE23xe5_yEVe8vCwqi07jV7nlopGLJpYOPCVOqMXAkBdYIZng1M5KLS.LNoUlJEK.qgKwC22zYI0he5cQcEIoWWgNRBKAYRIFBUVhn45GYEzAtZViv2KIOGoT2hUxluR1KqFhXcBMrK6KDMSIGYx0p8xP.6o1Pf4CuHeHckXqtxJbjnmTdnah9IJ15sfRZQFs4eptbC2gtj83Qs6ZX5XYsPLCPszhPa6TOcNkTm2YbEyISHnxxyrYY9So48ZYWWXkt2YDSsN72iPwU2uI.7KzvXTlYALYT2nBvSokWFHVuTHU1a93bvEDVL1WgxDImlWKsZicd7iKjkBlbPYYQDOBblQZvtzhABlS9K97lmNTcFu_WzNBdGwAdBX4W9.r_qIe_rZM3JQpPP37u9ao_BbxeF8sllLmnsTjdurvMInXt8j1tzyAMPHiO6UjPVNuqNYoIfd5flQVpNrrK4hSllCw23hIWdCMQUsH9MkE3JSgsxHglqAPr9beq6psvvWjTQ9DNovAZleBawr6pXUhObbflYnBUU1pLweQVpSoaclhNF2B5uhUS8V1AIMSbIKM0NnJohOgLkTd4BY9MR22vo8kX0PpXMxCToYcRyzqgtFIze81_gKChOe5.Q90g57eutyy6lwUNyp6CdleryZ_d4XqCZHqQ9p5W_jraXekjWqh2umuIZ2sqq8m0hqhyKCwCtHuLlw4QXy7jsXqCkI_pGF_ZW.CJbOWlrNm2sx2TauJPsZVVVw_H7kdVRhLdxX2MJBEf.U7NHjRkIuUewE3MSd8LWWZOmSnUwdHU75N5FsT.jqWQiVUeSrkmuqQ9Ccxfq9gFBSBGr0uYGESpxAiGjJQ0Fn4.fJvyIER_.KaxlPcCYFu9xSC3lTzEj1VvyXaRBcUbBcphLOwtTL3cWie4ufW6L8q_iwRgZVb.RfDzAazVDs4EvD9wJGh8jgnrVHiFmCek4nNq4xFFpPeg1FKr9cwoH6he7LTbmgh_IETiz7m0t5bHVqm6CoU32.RSpJekpjWcpZWdEg7iHjZbpfSKk3wJqu0H3dBijhQDKZm_eNDrg8AeaZpsCj5pdcjxK8WdgRFJSo3435niFL.n.Xz1RLPONWF63UhwvoOnaKVsflJPuduF5RQ2vbPW9sJJqyyaItA5pMHwlBurjJJqXxh1GQ_CieaCl6TCwnLdTJ3VlIjQCulp7vlx4di8_jOYNBLwekKA',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96b0e4618b1ac58d';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\/oisqmzyvly\/?__cf_chl_rt_tk=E3g8IgsrHi9dkprPwnqQ0Clq8p7icsHT5IClEpu0haM-1754508032-1.0.1.1-1J57SHrmCT9o5x5f5ZtV99T2Q8RFTotKqNOBRHpUJGQ"+ 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