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;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: '94a45bfb1ca6e5ba',cH: 'nQTz.LlhRdQHmHWQJVWVLszWy4aouGrv0ddR.uJ5SiU-1749007907-1.2.1.1-MrjxsQjBzXcsQu.7cLdpApaqt3TZ9QL2V5Ouzl5VahXohxQfS2VXW4Zi88thuGqn',cUPMDTk: "\/u\/rjshngqdiakmz\/?__cf_chl_tk=kB0RHo3WhVaSHBoHLd8NgUZG1z5Q_fvY1DL7xn0L5pU-1749007907-1.0.1.1-9up5bO_F9REHTejrlmDSbxoZupeinwHrtrXQzWz.U7Y",cFPWv: 'g',cITimeS: '1749007907',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/u\/rjshngqdiakmz\/?__cf_chl_f_tk=kB0RHo3WhVaSHBoHLd8NgUZG1z5Q_fvY1DL7xn0L5pU-1749007907-1.0.1.1-9up5bO_F9REHTejrlmDSbxoZupeinwHrtrXQzWz.U7Y",md: "utgqB46VDLjfHmSCzCNYOeh641ol3UViRMu876Pr6gM-1749007907-1.2.1.1-6EHgnpnmVHm74aQMngP5MvqDo.eHn87Q_gtiOCUNI2OvJW0e9YRuAgMIoFtmo4lTLME1yzM0XANF.fVHR2GgaIWY.UJhoBX00q.VbcBaqqaz1EvxZ8s9MB6nn2PGcgS2892lZXpCLfTGleWIjm5biGjLfsssiZa1WSgSZTwNyoOWLiP2szsbQ4OXtjV95PTA4YI.qOpC8XHH3eoCQXnIoLdjm4yKxvPTvKmx_7vubLzZqFcQxpDEblUbnNH_hxxwrDR8oSg4HhA1iQ9oNuOkFNOqKMNSgrnmFFXYK6VnfmFktZjZgriJfwR7d3zQaUUTwa4An.IEnE_KmNQpaaP88oL497dUqHhYmSyAKl2CEUBKmvrKmbf44EgqHRgIh_g7xgt8DBF5sTgnFyQ1GRbm0BD9Nz0AOUFInUi2SCO9kmyGW.v7mwtLAxQrOrhSK.jQpj9aozoGl9E6NGfpORwXYs_1Nt82RAQTgkot0R1Bb2fNdNatxhN9A7594VIi7Y5LfqcTry8nY6ZdszRCcTleKY7TGLXd4.oSQU9yfCibnZBUYhlWJfr7CNeADd1gJYZzAl3AMI4HzCY_0K7lUjlXiIApgupwO0_uNmL2efLY2nbRzph7wuP323PdzdsGoKME7ZEhrRL5moXZ12DMbuKw5PJiILLUHy5CxK3aTCFCzkGMRaq8Q1R3n2tmNnZX8_.nqsH6XP3dGkXXESjxxwOWLW0kWucdls2Ln_VWrC6V5YX1Y7959jHRFMY4HezzOS.sTInhd1MD_b4N1mIhYJn6vkaCVmuVY2VyNW9.owTbZZxRM1GiI6lNgHV.xlhVKQveHkyZ4RyFFTvyUOHPbeoXUukOuTvG0PZxhh2erYVE7rGDJxWmZ0SFyMjbZu4Zpvifggtej7G.XQSAyC.sSktd5YCF9GXJGIat6bYbmt9K75A",mdrd: "iP5toOqfCfvVCiqsnWMJUlpfIXf1Af.3Liz.SoPuXWY-1749007907-1.2.1.1-jmT316hztXV.h2JJt_OSK1SBRkmY35urPvN4eoINNWqpXBl0T.svLw2PF1y_U84ckmCWTp_GIzSasaKQ3TvDPsGngzL9itVryBWVEfE6m1n6uIPIoGDlGOnjuwfs09kVQoShBI5ayOzimrNq4ukp9mBCX5DEkgIjn.qCAIJqkxjhIqhBbDcNYyEf8XlpKUb0rfh710ogoxS8wYRM37YzoiO7D_QFLibHEmuBnyZRa0A8CQU.VP0WK3q_UgjpgnROMs576eVO.74tvQEXzlmi0hvxRtvz5.LpDK5QpE_THXfLjOzNcuPU3PCAVNCVyZ7IoTkCkhYdnB5NbIlSrrUH9MUCAYH_PNXzuZHfpow3XlDwulvNm3xVYZbDyYjgsj.4zzGK.f.HfAJ.96Spk7Pbe20uX5f4c27gTH7G.NKNFrRnbe_8iDpxzha5mRpUfY1QyQFBDH1SdffiqrznThiGlyG_YI1SX00eos9_8fPy5FVQCLXgnMx_u9kYlqN.T3FDGd5vy7wrqkDJBeB8jCTwWaw9z_nGsJQ7GL13tnaUbN_KK.BU8s..ECo9sV23QyeiwCd4PPOmr0BrxmhbWYbdN47w5BYfyQ71Tl0GRqYRs.Uu0eJpR22hgANDr6RlDFze0rZ3uUrzK232xZ0b.yZiPg1p78CBzpT4eHzP4z2AWmSugoMfC08AaMgP5MExOTlADYT43L4CEafdQke66ZKKgLxxwAiUqavrLPOCkMuLOtpKQRChmreONTEmuIlJqbHirmavad3afng3moM_1R_H5O16i1A.l2L6Z0c0kQ4XK4sTZXzGbTQGw5gA8i40aEzXP7EgpwsTOG_HYkAq5HUJoOZjBzkD.Qcipk4H.Ywl.bcwSnhAej10_b.lrko9oCLIYXEJruYdltWgLkaE50JszwBmcqa9zhtOPxzhkQggsgi4K0Hyvb0BGkHhRwkHKsKOS36tjJ8_GdrmI_O6sERvxHfLn1Gg5wAnYNJeh84DYtp2mhjBYRflFI041iikO9c2X3DgEfI_xC.vNiYPT2b_76N1RJ8CNGwN1ufHAVRyM53ojgwx0lg0cya8nisrHA_mp.qwQ4A3qIhgfMdgpSXzuWj9GImqZjJ13r.ifJcYlnYG3w5MQBWRwv5ZJy8BNoBfZJJ.Lgj2IYdNQ7elRLs5fSEKAjFY9gFfqNxdOw_P4wFalQMgacHUGnlPh1WHPzb3AJQrTWvZ3kvEczLzzLjd.oeYMtlK77VZTfFlSI2w2jJ46D6VzEXffl.1_GQDWXmfwAMfPlhauVWTppsgFajNKtdiiCYPJnCgRkxob18ZvjFjEErr8pg.JJ1ZWfQ_axF1slSI9YluswS19jMtBKu0L_S4LLGt6lpMLgSBZAd8pwar554IKuVA5K4DVjKkvHI398hbeA_dy_czjOQpkznzGa7ie3qj0RcaBq3KquMLU6CeynDLhzojd_5Xb6_WA4MH4elbjJE8sDuyXI_z0z6B29g9V2VxYyy3SL1CSQv73Exygey_RHRdRL2aeA_4.q9cG5qwMiq9am8g7BkMIICoGsaZ9ChDZgi6to3FGGrL8BkGU.pUbWbQ844Sx8elOJBEnbZAWsOw.RSYwMlyHTj4cw12lMIy10bwuOP8RLsVWaWOF_eL_ZtZ661efnxO2XApdSFnsAB7qE0SdMHn2H4n9KeganEaCBzZE8pNo2Nwb7YqQrL.eUCYE6EAJWjCa79Kb90UkCzmLjAQX1MpU_yT0BfQ59A9Pe2BKOe0_cgU2poXMn1DHMA4C35oli0iEZDN8M4F2_8JMKIkG1666hkm2aWsCQsk3be.ylq7MoEreRdJWJlbpVWWDH0.CPCqTuyj"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=94a45bfb1ca6e5ba';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\/rjshngqdiakmz\/?__cf_chl_rt_tk=kB0RHo3WhVaSHBoHLd8NgUZG1z5Q_fvY1DL7xn0L5pU-1749007907-1.0.1.1-9up5bO_F9REHTejrlmDSbxoZupeinwHrtrXQzWz.U7Y" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Home · About · News · Docs · Terms