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#include "ds/dynamic_array.hpp"
#pragma once template <typename T, bool PERSISTENT, int NODES> struct Dynamic_Array { static constexpr int LOG = 4; static constexpr int MASK = (1 << LOG) - 1; struct Node { T x; Node* ch[1 << LOG] = {}; }; Node* pool; int pid; using np = Node*; const T x0; Dynamic_Array(T default_value) : pid(0), x0(default_value) { pool = new Node[NODES]; } np new_root() { pool[pid].x = x0; fill(pool[pid].ch, pool[pid].ch + (1 << LOG), nullptr); return &(pool[pid++]); } np new_node(vc<T> dat) { np root = new_root(); FOR(i, len(dat)) root = set(root, i, dat[i], false); return root; } T get(np c, int idx) { if (!c) return x0; if (idx == 0) return c->x; return get(c->ch[idx & MASK], (idx - 1) >> LOG); } np set(np c, int idx, T x, bool make_copy = true) { c = (c ? copy_node(c, make_copy) : new_root()); if (idx == 0) { c->x = x; return c; } c->ch[idx & MASK] = set(c->ch[idx & MASK], (idx - 1) >> LOG, x); return c; } private: np copy_node(np c, bool make_copy) { if (!make_copy || !PERSISTENT) return c; pool[pid].x = c->x; FOR(k, (1 << LOG)) pool[pid].ch[k] = c->ch[k]; return &(pool[pid++]); } };
#line 2 "ds/dynamic_array.hpp" template <typename T, bool PERSISTENT, int NODES> struct Dynamic_Array { static constexpr int LOG = 4; static constexpr int MASK = (1 << LOG) - 1; struct Node { T x; Node* ch[1 << LOG] = {}; }; Node* pool; int pid; using np = Node*; const T x0; Dynamic_Array(T default_value) : pid(0), x0(default_value) { pool = new Node[NODES]; } np new_root() { pool[pid].x = x0; fill(pool[pid].ch, pool[pid].ch + (1 << LOG), nullptr); return &(pool[pid++]); } np new_node(vc<T> dat) { np root = new_root(); FOR(i, len(dat)) root = set(root, i, dat[i], false); return root; } T get(np c, int idx) { if (!c) return x0; if (idx == 0) return c->x; return get(c->ch[idx & MASK], (idx - 1) >> LOG); } np set(np c, int idx, T x, bool make_copy = true) { c = (c ? copy_node(c, make_copy) : new_root()); if (idx == 0) { c->x = x; return c; } c->ch[idx & MASK] = set(c->ch[idx & MASK], (idx - 1) >> LOG, x); return c; } private: np copy_node(np c, bool make_copy) { if (!make_copy || !PERSISTENT) return c; pool[pid].x = c->x; FOR(k, (1 << LOG)) pool[pid].ch[k] = c->ch[k]; return &(pool[pid++]); } };