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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/tests.h"
#include "td/utils/common.h"
#include "td/utils/Heap.h"
#include "td/utils/logging.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();
}
}
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