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< title > LeetCode Dependency Spine</ title >
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< p class = "eyebrow" > prdlk / leetcode · dependency spine</ p >
< h1 > How the 24 topics build on each other</ h1 >
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< title id = "dependency-spine-title" > LeetCode topic dependency spine</ title >
< desc id = "dependency-spine-desc" > Dependency graph of 24 LeetCode study topics across five phases, showing which topics build on which, with Tree DFS and 1-D dynamic programming as the two central hubs.</ desc >
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< text x = "60" y = "53" fill = "rgba(242,242,242,0.40)" font-size = "7" font-family = "'IBM Plex Mono', monospace" letter-spacing = "0.14em" > PHASE I — LINEAR STRUCTURES</ text >
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< text x = "476" y = "53" fill = "rgba(242,242,242,0.40)" font-size = "7" font-family = "'IBM Plex Mono', monospace" letter-spacing = "0.14em" > PHASE III — HIERARCHICAL</ text >
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< text x = "476" y = "397" fill = "rgba(242,242,242,0.40)" font-size = "7" font-family = "'IBM Plex Mono', monospace" letter-spacing = "0.14em" > PHASE II — NODAL & GRID</ text >
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< text x = "892" y = "53" fill = "rgba(242,242,242,0.40)" font-size = "7" font-family = "'IBM Plex Mono', monospace" letter-spacing = "0.14em" > PHASES IV– & DECISION-SPACE</ text >
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<!-- 05 Binary Search — entry -->
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<!-- 03 Two Pointers — entry -->
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< text x = "76" y = "159" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 03</ text >
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<!-- 04 Sliding Window -->
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< text x = "268" y = "159" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 04</ text >
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<!-- 06 Stack — entry -->
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< text x = "76" y = "231" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 06</ text >
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<!-- 07 Monotonic Stack -->
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<!-- 01 Hash-Based Lookup — entry -->
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< text x = "76" y = "303" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 01</ text >
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<!-- 02 Prefix Sum -->
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< text x = "268" y = "303" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 02</ text >
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<!-- 11 Tree DFS — FOCAL -->
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<!-- 13 Binary Search Tree -->
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< text x = "492" y = "159" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 13</ text >
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<!-- 14 Heap -->
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<!-- 15 Trie -->
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< text x = "684" y = "231" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 15</ text >
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<!-- 12 Tree BFS — entry -->
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<!-- 08 Linked List — entry -->
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< text x = "492" y = "431" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 08</ text >
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<!-- 09 Hybrid Structures -->
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< text x = "684" y = "431" fill = "#989898" font-size = "7" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" letter-spacing = "0.08em" > 09</ text >
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<!-- 10 Matrix Index Math -->
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< text x = "544" y = "520" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > Matrix Index Math</ text >
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<!-- 16 Graph DFS -->
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< text x = "960" y = "104" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > Graph DFS</ text >
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<!-- 18 Topological Sort -->
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< text x = "1152" y = "104" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > Topological Sort</ text >
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<!-- 19 Union-Find -->
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<!-- 20 Backtracking -->
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< text x = "1152" y = "176" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > Backtracking</ text >
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<!-- 21 1-D DP — FOCAL -->
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< text x = "1152" y = "242" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > 1-D DP</ text >
< text x = "1152" y = "256" fill = "#989898" font-size = "9" font-family = "'IBM Plex Mono', monospace" text-anchor = "middle" > dynamic programming</ text >
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<!-- 22 Multi-D / Grid DP -->
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<!-- 17 Graph BFS -->
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< text x = "960" y = "320" fill = "#f2f2f2" font-size = "12" font-weight = "600" font-family = "'Inter', sans-serif" text-anchor = "middle" > Graph BFS</ text >
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<!-- 23 Greedy -->
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<!-- 24 Intervals -->
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< text x = "820" y = "618" fill = "#989898" font-size = "8" font-family = "'IBM Plex Mono', monospace" letter-spacing = "0.06em" > PHASE ZONE</ text >
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