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: '96b1ef891ddd16de',cH: 'liXUrmKC3lREz7FfjJoeMVBMVAlP2Bdr9qrZqNGs1_E-1754518974-1.2.1.1-GEJBoloC9..pEgk6EJg5GCUtLrIHII.QxmR.njPTu7zwLI0pPvAAPUq2zitlOlOl',cUPMDTk:"\/u\/ddzogmiqlwnh\/?__cf_chl_tk=05fmWvDuRbPkWezDv87Xsy_WvUJ3OV0ZWobQhBsaJSY-1754518974-1.0.1.1-HkAYKke_QrDsom036xq75abjzUFQMlPa4yOqOEFngbM",cFPWv: 'b',cITimeS: '1754518974',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/ddzogmiqlwnh\/?__cf_chl_f_tk=05fmWvDuRbPkWezDv87Xsy_WvUJ3OV0ZWobQhBsaJSY-1754518974-1.0.1.1-HkAYKke_QrDsom036xq75abjzUFQMlPa4yOqOEFngbM",md: 'YBGZoXyhaefgd8RVSvaVG2cpaQVv.LvOq5DAbXSKk_g-1754518974-1.2.1.1-woteL.P.kUlyy5mDnzZJzHMLKTNb3UZ7gRsTL4RUiJi0kRohy127NU0kMoGTD_TYrQRRnzoWDcZfAVc74V2zXSl13rqv5_ZOHe8QGZmfA4wzz99Ae1oFww1Kw1ocV2AAaaiY9RrX57xxPC5CwRzBc1L6kJaUwdlzV2IAqr5q_.o5BuGLfdo_x9Jz39IXpto33gos6PtEIdM5x0LLgvVL.mi7_kSmTzc5Qau7pvSVlB6a1W6e_I.AAnn3DDuibj6MnjfFdplefeXdF4NEPzcSZ7cN9MYQjKT5yhlUugdmwrWOB5o4zWtAFiuZ7mjxGyQbVK_rAyB0KENAbNhbf3c6gf43naWbtk99mTYqqBubDJxdGrKbsea8LPKU41pzGOIcZ4isdXYq6i_SpmRHxJ40nfU.U1IIVZWUiZKh7ezponxsrHbSe7JqBwwt_rHKlPrKQrqolnQlLIlVJksUjkArKYqSSRnwMqbniBGqJKNTkWwuxjUNuynG32foXwRqr1ID.y7A.TtzerL3jDKWhuw6z4w74rblUzxiCRijrt_acit4eycTBBJfHubaZKuhW3GdoBztNzsbqGZegLxbhDfXKwrIJBlu_eBom.ML7IRGahIFzVQymf7skxc0pPBm3l.s8ZA_jM2b06rveZIchvwTYaAws42ygeTH7Tscs07JHSsQQz_yPxIshT4ieA3E7OxbHM25m71umfbL9C2VxqFvwBHXIuh3hy5QcJ2YFrAHRDl7BdhkMLjYxxp.wmn24HBIRrW3JKYsN50YfhuHDrWTAtY7Ilz8d1GACihEfOCpmBCnLiMqP8BikPlMQws96jr1mxsau0f1vaLJBNy7IGj2Jjfz8hoqV5XmwPXTKrUQ8Aq59sD0yGt9ibAlWWQHa.Ee2xMors8e_JMqSArmHApLxAXY9DqxrH6iBoMmAzOAAqo',mdrd: 'e9woqxzfD7JuOCK.HNOVt23RndzNDu.gBn7TNAZ2IFM-1754518974-1.2.1.1-uBpJTHIsm.G4YGbhlE5J6XjVabVB8wTrZZFqcpDB12TBnY_1fIVnEfQtBk9xbS7E5XlQORYOKhpjG1XTbmwQuO71A9Ft04xjl4fhozjYr3jt4sS97GTXiUl26sG4OZ1xRsDJ7T_hZDtOaDcPSQ0BmmDccJbyGnbzc_zpLs7ljCWw5MFroy.32edqeHiZqk2A8kaMoAUCcwWX_oPxH5nL2WOPZXmu_KiJTweEgxdgZZpm4sIi1wablysCl.xweVdzSSMXmatB7r6lZGlRkPoE0yabySmTmZATEOBCb6gxW_cwQs.tIl9fiGvEDKVpoPCwJQM.EvGA_A5k579MNJPCQiOUMljgWMaULyt7.qzJSduNvu3tPyDgFM0cmWGn7ecIX3pK6hsACQ4ROwmC8r9m.Y4W7m0OtnT3EWpWfslclOSaVqgIFaSJt_uN4q3wQ2URzJDp0lGDzZmvzuPths3mBqfet3WzELFJoE__EPUzJZVL4ORQVyyvgh.XfTBL1ZKAV.VKq_o_j.WrYFP2JX5.915BtQk9dzWMOSXT.D7c5SiQUz1XSO04.wHMPgD2TbQV43FdeWI2CLqQp.gm399zLkDy_h0YvuE1MgNUn6T0Vul2sL0qZ._TMN9Zo5K3ms3vtIMC0wZCeBlE6T33dV1tAdSfifGqRdhY1Hal7ObTC770A8bgHdocxtGbPY.p4fDHQ96JkHGUxqaWP_53unC81VpwtAkzslZIhdyuNRSS2Ex.jAPfiQmVCNeDQw67diM5lyPLh.Mw0cX3Ks5051mwRupSk.xeyEowZYUqXQWYtYRj49KeqqoMH5VcmD0QwXg6UxUaMBXBn1fENu2dI2KquIasvm5vb.xCutYY9HKq1Gcuq9yfNoJ24lCn4oWg6hl9_gMwZf2_b6ebccL6rz101qKyvTFDKnRWQLdwKHv4aS_vdaooNJW9_7LPcpThEZQjDdQw3PT5kCzrY45Chh5Lq7XMoJSsGSSW0HvUvcraOkxX2XVehtJ18wTULhhBPnsKUQeqr1olayOqPzSi5LTw9OtyLU7rMo58KXaKtn6Ow1qhsDgjZ3_CV9yVYTAJis0PkWUGtlDuLLDA6qHIx6YOtSteQWBvkGHpJT2PKMNcy1A85090sW_0L5aGwcMpBcfafLjT.JduOuJcHcCB9TJZiWPvH.aiTpeAbpzYvny99.fDnz_sRelypWd0esqoHCU9wztveE6ijxIQfoqI6O5qk4kn9u24_zdC7JXT43sKLF6Olhj3nXvvmUrFGVVVOboWuNBF8To.k_yLhjJW4wLtppOBl5FORxSFb26jCbcW7qaQCWRdabS0sfTQGqU6XkFwprKP3Kg3K7rLYQn9d1q7DxHyCs1enwwA.e2pE7Gva0m7YarqzLvPB0.MO_ArsxVxLLCWhxfnpE1mp0lxRT60X7pa1dgmlEsCawGAFK7xUuCmWNVdabq0L43yTyFgU8vAbZm3UMoLkBmKVmfxw8Zirbql6Ft8GoQ8ADUijYDtITo2b_psABhACGhXg9o3ONLlqq1VFYQSFr1oedUMiyYkPjtgAUG4Xt9YKTiJ5.V8CInc5MwGZm2CpfAnyq8LpI2rPqQVkH5qHj6.HApmZn3Ibaq3fZsPDdb4h9Lw16QjsBuDmMX_ZOW7n4hiLuqwImozr6_9M5kfunxCXyGfaZ6IPVyZr1tFdcsIWoH3Y3qjCVv4uC8dicIcapC.0NHUOu4Xsh2yqOHqQJEltlVlG6i.rMQ5oy_8ncGrv6dz2_LUi4GV4NNi.Maqzb0gBUgIlVMDdMB64pVaD1YTbau6yiOni6CQdtTfeBpYtkETvATJEXvxQYKK2fB5l_iGMYeotvAjfZD3X9HZLngXupuEUjnHpQ',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96b1ef891ddd16de';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\/ddzogmiqlwnh\/?__cf_chl_rt_tk=05fmWvDuRbPkWezDv87Xsy_WvUJ3OV0ZWobQhBsaJSY-1754518974-1.0.1.1-HkAYKke_QrDsom036xq75abjzUFQMlPa4yOqOEFngbM"+ 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