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HackerRank | Practice, Tutorials & Interview Preparation Solutions

This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
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Stars
38 stars
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1 watching
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6 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
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Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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HackerRank Logo | Eda AYDIN Profile
HackerRank | Practice, Tutorials & Interview Preparation Solutions
This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, SQL, C++, and Java.
GitHub last commitGitHub repo sizeGitHub LicenseGitHub Written inGitHub WakaTime
Personal HackerRank Profile
View Profile
HackerRank Badges
Problem Solving30 Days of Code10 Days of StatisticsPythonJavaSQL
HackerRank Certificates
Problem Solving (Basic) CertificateProblem Solving (Intermediate) CertificatePython (Basic) CertificateJava (Basic) CertificateSQL (Basic) CertificateSQL (Intermediate) CertificateSQL (Advanced) Certificate
HackerRank Role Certificates
Software Engineer Intern CertificateSoftware Engineer Certificate
About
This repository includes HackerRank Solutions
Topics
artificial-intelligencehackerrankhackerrank-30dayschallangehackerrank-algorithms-solutionshackerrank-artificialintelligencehackerrank-interview-kithackerrank-java-solutionshackerrank-python-solutionshackerrank-solutionhackerrank-solutionshackerrank-sql-solutionshackerrank-statisticsjavajava-8pythonpython3sql
Resources
Readme
Apache-2.0 license
Activity
Stars
38 stars
Watchers
1 watching
Forks
6 forks
Report repository
Contributors
Languages