54 lines
No EOL
1.7 KiB
Text
54 lines
No EOL
1.7 KiB
Text
---
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id: tree-euler
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title: "Euler Tour on Tree"
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author: "?"
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prerequisites:
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- Silver - Depth First Search
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- Gold - Static Range Queries
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- Gold - Point Update Range Sum
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description: Subtree updates and queries as well as a way to compute lowest common ancestors.
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frequency: 2
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---
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import { Problem } from "../models";
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export const metadata = {
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problems: {
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sample: [
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new Problem("CSES", "Subtree Queries", "1137", "Easy", false, ["Euler-Tree"], "equivalent to https://judge.yosupo.jp/problem/vertex_add_subtree_sum"),
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],
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lca: [
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new Problem("CSES", "Company Queries II", "1688", "Easy", false, ["LCA"], ""),
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],
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problems: [
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new Problem("CSES", "Distance Queries", "1135", "Easy", false, ["LCA"], ""),
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new Problem("CSES", "Path Queries", "1138", "Easy", false, ["Euler-Tree","PURS"], "equivalent to https://judge.yosupo.jp/problem/vertex_add_path_sum"),
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new Problem("Gold", "Cow Land", "921", "Normal", false, ["Euler-Tree","PURS", "HLD"], ""),
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new Problem("Gold", "Milk Visits", "970", "Normal", false, ["Euler-Tree", "LCA"], ""),
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new Problem("Plat", "Promotion Counting", "696", "Normal", false, ["Euler-Tree","PURS"], ""),
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new Problem("ojuz", "IOI Regions", "IOI09_regions", "Hard", false, ["Euler-Tree", "Binary Search"], ""),
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new Problem("Plat", "Snow-Cow", "973", "Hard", false, ["Euler-Tree","PURS"], ""),
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]
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}
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};
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## Introduction
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<problems-list problems={metadata.problems.sample} />
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### Tutorial
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- CPH 18.2 - Subtrees & Paths
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## LCA
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### Tutorial
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- CPH 18.3 - Least Common Ancestor
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- [cp-algorithms - LCA with Sparse Table](https://cp-algorithms.com/graph/lca.html)
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(implementation)
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## Problems
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<problems-list problems={metadata.problems.problems} /> |