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#include "library/datastructure/union_find/union_find_component_sum.hpp"
#ifndef SUISEN_UNION_FIND_COMPONENT_SUM #define SUISEN_UNION_FIND_COMPONENT_SUM #include "library/datastructure/union_find/union_find.hpp" namespace suisen { template <typename T, void(*merge_data)(T&, T)> struct UnionFindComponentSum : UnionFind { UnionFindComponentSum() : UnionFindComponentSum(0) {} explicit UnionFindComponentSum(int n, const T &init_value = T{}) : UnionFindComponentSum(std::vector<T>(n, init_value)) {} explicit UnionFindComponentSum(const std::vector<T> &init_values) : UnionFind(init_values.size()), _sum(init_values) {} bool merge(int x, int y) { x = root(x), y = root(y); bool res = UnionFind::merge(x, y); if (res) { if (root(x) == y) std::swap(x, y); merge_data(_sum[x], std::move(_sum[y])); } return res; } const T& sum(int x) { return _sum[root(x)]; } private: std::vector<T> _sum; }; } // namespace suisen #endif // SUISEN_UNION_FIND_COMPONENT_SUM
#line 1 "library/datastructure/union_find/union_find_component_sum.hpp" #line 1 "library/datastructure/union_find/union_find.hpp" #include <algorithm> #include <vector> namespace suisen { struct UnionFind { UnionFind() = default; explicit UnionFind(int _n) : _n(_n), _dat(_n, -1) {} // Get the root of `x`. equivalent to `operator[](x)` int root(int x) { static std::vector<int> buf; while (_dat[x] >= 0) buf.push_back(x), x = _dat[x]; while (buf.size()) _dat[buf.back()] = x, buf.pop_back(); return x; } // Get the root of `x`. euivalent to `root(x)` int operator[](int x) { return root(x); } // Merge two vertices `x` and `y`. bool merge(int x, int y) { x = root(x), y = root(y); if (x == y) return false; if (_dat[x] > _dat[y]) std::swap(x, y); _dat[x] += _dat[y], _dat[y] = x; return true; } // Check if `x` and `y` belongs to the same connected component. bool same(int x, int y) { return root(x) == root(y); } // Get the size of connected componet to which `x` belongs. int size(int x) { return -_dat[root(x)]; } // Get all of connected components. std::vector<std::vector<int>> groups() { std::vector<std::vector<int>> res(_n); for (int i = 0; i < _n; ++i) res[root(i)].push_back(i); res.erase(std::remove_if(res.begin(), res.end(), [](const auto& g) { return g.empty(); }), res.end()); return res; } protected: int _n; std::vector<int> _dat; }; } // namespace suisen #line 5 "library/datastructure/union_find/union_find_component_sum.hpp" namespace suisen { template <typename T, void(*merge_data)(T&, T)> struct UnionFindComponentSum : UnionFind { UnionFindComponentSum() : UnionFindComponentSum(0) {} explicit UnionFindComponentSum(int n, const T &init_value = T{}) : UnionFindComponentSum(std::vector<T>(n, init_value)) {} explicit UnionFindComponentSum(const std::vector<T> &init_values) : UnionFind(init_values.size()), _sum(init_values) {} bool merge(int x, int y) { x = root(x), y = root(y); bool res = UnionFind::merge(x, y); if (res) { if (root(x) == y) std::swap(x, y); merge_data(_sum[x], std::move(_sum[y])); } return res; } const T& sum(int x) { return _sum[root(x)]; } private: std::vector<T> _sum; }; } // namespace suisen