diff --git a/data/neetcode-150.json b/data/neetcode-150.json
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+{
+  "Arrays & Hashing": [
+    "contains-duplicate",
+    "valid-anagram",
+    "two-sum",
+    "group-anagrams",
+    "top-k-frequent-elements",
+    "encode-and-decode-strings",
+    "product-of-array-except-self",
+    "valid-sudoku",
+    "longest-consecutive-sequence"
+  ],
+  "Two Pointers": [
+    "valid-palindrome",
+    "two-sum-ii-input-array-is-sorted",
+    "3sum",
+    "container-with-most-water",
+    "trapping-rain-water"
+  ],
+  "Sliding Window": [
+    "best-time-to-buy-and-sell-stock",
+    "longest-substring-without-repeating-characters",
+    "longest-repeating-character-replacement",
+    "permutation-in-string",
+    "minimum-window-substring",
+    "sliding-window-maximum"
+  ],
+  "Stack": [
+    "valid-parentheses",
+    "min-stack",
+    "evaluate-reverse-polish-notation",
+    "daily-temperatures",
+    "car-fleet",
+    "largest-rectangle-in-histogram"
+  ],
+  "Binary Search": [
+    "binary-search",
+    "search-a-2d-matrix",
+    "koko-eating-bananas",
+    "find-minimum-in-rotated-sorted-array",
+    "search-in-rotated-sorted-array",
+    "time-based-key-value-store",
+    "median-of-two-sorted-arrays"
+  ],
+  "Linked List": [
+    "reverse-linked-list",
+    "merge-two-sorted-lists",
+    "linked-list-cycle",
+    "reorder-list",
+    "remove-nth-node-from-end-of-list",
+    "copy-list-with-random-pointer",
+    "add-two-numbers",
+    "find-the-duplicate-number",
+    "lru-cache",
+    "merge-k-sorted-lists",
+    "reverse-nodes-in-k-group"
+  ],
+  "Trees": [
+    "invert-binary-tree",
+    "maximum-depth-of-binary-tree",
+    "diameter-of-binary-tree",
+    "balanced-binary-tree",
+    "same-tree",
+    "subtree-of-another-tree",
+    "lowest-common-ancestor-of-a-binary-search-tree",
+    "binary-tree-level-order-traversal",
+    "binary-tree-right-side-view",
+    "count-good-nodes-in-binary-tree",
+    "validate-binary-search-tree",
+    "kth-smallest-element-in-a-bst",
+    "construct-binary-tree-from-preorder-and-inorder-traversal",
+    "binary-tree-maximum-path-sum",
+    "serialize-and-deserialize-binary-tree"
+  ],
+  "Heap / Priority Queue": [
+    "kth-largest-element-in-a-stream",
+    "last-stone-weight",
+    "k-closest-points-to-origin",
+    "kth-largest-element-in-an-array",
+    "task-scheduler",
+    "design-twitter",
+    "find-median-from-data-stream"
+  ],
+  "Backtracking": [
+    "subsets",
+    "combination-sum",
+    "combination-sum-ii",
+    "permutations",
+    "subsets-ii",
+    "generate-parentheses",
+    "word-search",
+    "palindrome-partitioning",
+    "letter-combinations-of-a-phone-number",
+    "n-queens"
+  ],
+  "Tries": [
+    "implement-trie-prefix-tree",
+    "design-add-and-search-words-data-structure",
+    "word-search-ii"
+  ],
+  "Graphs": [
+    "number-of-islands",
+    "max-area-of-island",
+    "clone-graph",
+    "walls-and-gates",
+    "rotting-oranges",
+    "pacific-atlantic-water-flow",
+    "surrounded-regions",
+    "course-schedule",
+    "course-schedule-ii",
+    "graph-valid-tree",
+    "number-of-connected-components-in-an-undirected-graph",
+    "redundant-connection",
+    "word-ladder"
+  ],
+  "Advanced Graphs": [
+    "network-delay-time",
+    "reconstruct-itinerary",
+    "min-cost-to-connect-all-points",
+    "swim-in-rising-water",
+    "alien-dictionary",
+    "cheapest-flights-within-k-stops"
+  ],
+  "1-D Dynamic Programming": [
+    "climbing-stairs",
+    "min-cost-climbing-stairs",
+    "house-robber",
+    "house-robber-ii",
+    "longest-palindromic-substring",
+    "palindromic-substrings",
+    "decode-ways",
+    "coin-change",
+    "maximum-product-subarray",
+    "word-break",
+    "longest-increasing-subsequence",
+    "partition-equal-subset-sum"
+  ],
+  "2-D Dynamic Programming": [
+    "unique-paths",
+    "longest-common-subsequence",
+    "best-time-to-buy-and-sell-stock-with-cooldown",
+    "coin-change-ii",
+    "target-sum",
+    "interleaving-string",
+    "longest-increasing-path-in-a-matrix",
+    "distinct-subsequences",
+    "edit-distance",
+    "burst-balloons",
+    "regular-expression-matching"
+  ],
+  "Greedy": [
+    "maximum-subarray",
+    "jump-game",
+    "jump-game-ii",
+    "gas-station",
+    "hand-of-straights",
+    "merge-triplets-to-form-target-triplet",
+    "partition-labels",
+    "valid-parenthesis-string"
+  ],
+  "Intervals": [
+    "insert-interval",
+    "merge-intervals",
+    "non-overlapping-intervals",
+    "meeting-rooms",
+    "meeting-rooms-ii",
+    "minimum-interval-to-include-each-query"
+  ],
+  "Math & Geometry": [
+    "rotate-image",
+    "spiral-matrix",
+    "set-matrix-zeroes",
+    "happy-number",
+    "plus-one",
+    "powx-n",
+    "multiply-strings",
+    "detect-squares"
+  ],
+  "Bit Manipulation": [
+    "single-number",
+    "number-of-1-bits",
+    "counting-bits",
+    "reverse-bits",
+    "missing-number",
+    "sum-of-two-integers",
+    "reverse-integer"
+  ]
+}