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tdutils/test/heap.cpp

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#include "td/utils/tests.h"
+
+#include "td/utils/common.h"
+#include "td/utils/Heap.h"
+#include "td/utils/Random.h"
+
+#include <algorithm>
+#include <cstdio>
+#include <cstdlib>
+#include <set>
+#include <utility>
+
+REGISTER_TESTS(heap)
+
+using namespace td;
+
+TEST(Heap, sort_random_perm) {
+  int n = 1000000;
+  std::vector<int> v(n);
+  for (int i = 0; i < n; i++) {
+    v[i] = i;
+  }
+  std::srand(123);
+  std::random_shuffle(v.begin(), v.end());
+  std::vector<HeapNode> nodes(n);
+  KHeap<int> kheap;
+  for (int i = 0; i < n; i++) {
+    kheap.insert(v[i], &nodes[i]);
+  }
+  for (int i = 0; i < n; i++) {
+    ASSERT_EQ(i, kheap.top_key());
+    kheap.pop();
+  }
+};
+
+class CheckedHeap {
+ public:
+  void set_max_size(int max_size) {
+    nodes.resize(max_size);
+    free_ids.resize(max_size);
+    rev_ids.resize(max_size);
+    for (int i = 0; i < max_size; i++) {
+      free_ids[i] = max_size - i - 1;
+      nodes[i].value = i;
+    }
+  }
+  static void xx(int key, const HeapNode *heap_node) {
+    const Node *node = static_cast<const Node *>(heap_node);
+    std::fprintf(stderr, "(%d;%d)", node->key, node->value);
+  }
+  void check() const {
+    for (auto p : set_heap) {
+      std::fprintf(stderr, "(%d;%d)", p.first, p.second);
+    }
+    std::fprintf(stderr, "\n");
+    kheap.for_each(xx);
+    std::fprintf(stderr, "\n");
+    kheap.check();
+  }
+  int random_id() const {
+    CHECK(!empty());
+    return ids[Random::fast(0, static_cast<int>(ids.size() - 1))];
+  }
+  size_t size() const {
+    return ids.size();
+  }
+  bool empty() const {
+    return ids.empty();
+  }
+
+  int top_key() const {
+    CHECK(!empty());
+    int res = set_heap.begin()->first;
+    ASSERT_EQ(set_heap.size(), kheap.size());
+    ASSERT_EQ(res, kheap.top_key());
+    return res;
+  }
+  int insert(int key) {
+    // std::fprintf(stderr, "insert %d\n", key);
+    int id;
+    if (free_ids.empty()) {
+      UNREACHABLE();
+      id = static_cast<int>(nodes.size());
+      nodes.emplace_back(key, id);
+      rev_ids.push_back(-1);
+    } else {
+      id = free_ids.back();
+      free_ids.pop_back();
+      nodes[id].key = key;
+    }
+    rev_ids[id] = static_cast<int>(ids.size());
+    ids.push_back(id);
+    kheap.insert(key, &nodes[id]);
+    set_heap.emplace(key, id);
+    return id;
+  }
+  void fix_key(int new_key, int id) {
+    // std::fprintf(stderr, "fix key %d %d (old_key = %d)\n", new_key, id, nodes[id].key);
+    set_heap.erase(std::make_pair(nodes[id].key, id));
+    nodes[id].key = new_key;
+    kheap.fix(new_key, &nodes[id]);
+    set_heap.emplace(new_key, id);
+  }
+  void erase(int id) {
+    // std::fprintf(stderr, "erase %d\n", id);
+    int pos = rev_ids[id];
+    CHECK(pos != -1);
+    ids[pos] = ids.back();
+    rev_ids[ids[pos]] = pos;
+    ids.pop_back();
+    rev_ids[id] = -1;
+    free_ids.push_back(id);
+
+    kheap.erase(&nodes[id]);
+    set_heap.erase(std::make_pair(nodes[id].key, id));
+  }
+  void pop() {
+    // std::fprintf(stderr, "pop\n");
+    CHECK(!empty());
+    Node *node = static_cast<Node *>(kheap.pop());
+    int id = node->value;
+    ASSERT_EQ(node->key, set_heap.begin()->first);
+
+    int pos = rev_ids[id];
+    CHECK(pos != -1);
+    ids[pos] = ids.back();
+    rev_ids[ids[pos]] = pos;
+    ids.pop_back();
+    rev_ids[id] = -1;
+    free_ids.push_back(id);
+
+    set_heap.erase(std::make_pair(nodes[id].key, id));
+  }
+
+ private:
+  struct Node : public HeapNode {
+    Node() = default;
+    Node(int key, int value) : key(key), value(value) {
+    }
+    int key = 0;
+    int value = 0;
+  };
+  vector<int> ids;
+  vector<int> rev_ids;
+  vector<int> free_ids;
+  vector<Node> nodes;
+  std::set<std::pair<int, int>> set_heap;
+  KHeap<int> kheap;
+};
+
+TEST(Heap, random_events) {
+  CheckedHeap heap;
+  heap.set_max_size(1000);
+  for (int i = 0; i < 300000; i++) {
+    if (!heap.empty()) {
+      heap.top_key();
+    }
+
+    int x = Random::fast(0, 4);
+    if (heap.empty() || (x < 2 && heap.size() < 1000)) {
+      heap.insert(Random::fast(0, 99));
+    } else if (x < 3) {
+      heap.fix_key(Random::fast(0, 99), heap.random_id());
+    } else if (x < 4) {
+      heap.erase(heap.random_id());
+    } else if (x < 5) {
+      heap.pop();
+    }
+    // heap.check();
+  }
+}