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// DisjointSet {{{ struct DSU { vector<int> lab; DSU(int n) : lab(n+1, -1) {} int getRoot(int u) { if (lab[u] < 0) return u; return lab[u] = getRoot(lab[u]); } bool merge(int u, int v) { u = getRoot(u); v = getRoot(v); if (u == v) return false; if (lab[u] > lab[v]) swap(u, v); lab[u] += lab[v]; lab[v] = u; return true; } bool same_component(int u, int v) { return getRoot(u) == getRoot(v); } int component_size(int u) { return -lab[getRoot(u)]; } }; // }}}
#line 1 "DataStructure/DSU/DisjointSet.h" // DisjointSet {{{ struct DSU { vector<int> lab; DSU(int n) : lab(n+1, -1) {} int getRoot(int u) { if (lab[u] < 0) return u; return lab[u] = getRoot(lab[u]); } bool merge(int u, int v) { u = getRoot(u); v = getRoot(v); if (u == v) return false; if (lab[u] > lab[v]) swap(u, v); lab[u] += lab[v]; lab[v] = u; return true; } bool same_component(int u, int v) { return getRoot(u) == getRoot(v); } int component_size(int u) { return -lab[getRoot(u)]; } }; // }}}