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#include "data_structure/weighted_unionfind.hpp"
parents
diff_weight
merge()
x
weight(x)
leader(x)
w
weight(y) - weight(x)
w += weight(x)
weight(y) - weight(leader(x))
w -= weight(y)
weight(leader(y)) - weight(leader(x))
leader(y)
diff_weight[y] = w
groups()
#pragma once template <class T> struct WeightedUnionFind { int n; std::vector<int> parents; std::vector<T> diff_weight; WeightedUnionFind() {} WeightedUnionFind(int n) : n(n), parents(n, -1), diff_weight(n, T(0)) {} int leader(int x) { if (parents[x] < 0) { return x; } else { int r = leader(parents[x]); diff_weight[x] += diff_weight[parents[x]]; return parents[x] = r; } } T weight(int x) { leader(x); return diff_weight[x]; } // weight(y) = weight(x) + w bool merge(int x, int y, T w) { w += weight(x); w -= weight(y); x = leader(x), y = leader(y); if (x == y) return false; if (parents[x] > parents[y]) std::swap(x, y), w = -w; parents[x] += parents[y]; parents[y] = x; diff_weight[y] = w; return true; } // return weight(y) - weight(x) T diff(int x, int y) { return weight(y) - weight(x); } bool same(int x, int y) { return leader(x) == leader(y); } int size(int x) { return -parents[leader(x)]; } // 連結成分ごとに (頂点番号 v, diff(leader(v), v)) の配列を返す std::vector<std::vector<std::pair<int, T>>> groups() { std::vector<int> leader_buf(n), group_size(n); for (int i = 0; i < n; i++) { leader_buf[i] = leader(i); group_size[leader_buf[i]]++; } std::vector<std::vector<std::pair<int, T>>> result(n); for (int i = 0; i < n; i++) { result[i].reserve(group_size[i]); } for (int i = 0; i < n; i++) { result[leader_buf[i]].emplace_back(i, weight(i)); } result.erase(std::remove_if(result.begin(), result.end(), [&](const std::vector<std::pair<int, T>>& v) { return v.empty(); }), result.end()); return result; } void init(int n) { parents.assign(n, -1), diff_weight.assign(n, T(0)); } // reset };
#line 2 "data_structure/weighted_unionfind.hpp" template <class T> struct WeightedUnionFind { int n; std::vector<int> parents; std::vector<T> diff_weight; WeightedUnionFind() {} WeightedUnionFind(int n) : n(n), parents(n, -1), diff_weight(n, T(0)) {} int leader(int x) { if (parents[x] < 0) { return x; } else { int r = leader(parents[x]); diff_weight[x] += diff_weight[parents[x]]; return parents[x] = r; } } T weight(int x) { leader(x); return diff_weight[x]; } // weight(y) = weight(x) + w bool merge(int x, int y, T w) { w += weight(x); w -= weight(y); x = leader(x), y = leader(y); if (x == y) return false; if (parents[x] > parents[y]) std::swap(x, y), w = -w; parents[x] += parents[y]; parents[y] = x; diff_weight[y] = w; return true; } // return weight(y) - weight(x) T diff(int x, int y) { return weight(y) - weight(x); } bool same(int x, int y) { return leader(x) == leader(y); } int size(int x) { return -parents[leader(x)]; } // 連結成分ごとに (頂点番号 v, diff(leader(v), v)) の配列を返す std::vector<std::vector<std::pair<int, T>>> groups() { std::vector<int> leader_buf(n), group_size(n); for (int i = 0; i < n; i++) { leader_buf[i] = leader(i); group_size[leader_buf[i]]++; } std::vector<std::vector<std::pair<int, T>>> result(n); for (int i = 0; i < n; i++) { result[i].reserve(group_size[i]); } for (int i = 0; i < n; i++) { result[leader_buf[i]].emplace_back(i, weight(i)); } result.erase(std::remove_if(result.begin(), result.end(), [&](const std::vector<std::pair<int, T>>& v) { return v.empty(); }), result.end()); return result; } void init(int n) { parents.assign(n, -1), diff_weight.assign(n, T(0)); } // reset };