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feat: Added merge-insertion sort from #246 (#1062)

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* Create Merge-insertion sort.cpp

* fixed file path

* working code

* added documentation

* replace c-style array with std::array

* updating DIRECTORY.md

* clang-format and clang-tidy fixes for 8b3a6634

Co-authored-by: sinkyoungdeok <tlsrudejr123@nate.com>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
This commit is contained in:
Krishna Vedala
2020-09-03 08:51:30 -04:00
committed by GitHub
parent a9da541127
commit 08c4a3f664
3 changed files with 174 additions and 6 deletions
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16
data_structures/skip_list.cpp
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@@ -64,7 +64,7 @@ class SkipList {
SkipList() {
level = 0;
// Header initialization
header = std::shared_ptr<Node>(new Node(-1, MAX_LEVEL));
header = std::make_shared<Node>(-1, MAX_LEVEL);
}
/**
@@ -75,8 +75,9 @@ class SkipList {
int randomLevel() {
int lvl = 0;
while (static_cast<float>(std::rand()) / RAND_MAX < PROBABILITY &&
lvl < MAX_LEVEL)
lvl < MAX_LEVEL) {
lvl++;
}
return lvl;
}
@@ -93,8 +94,9 @@ class SkipList {
update.fill(nullptr);
for (int i = level; i >= 0; i--) {
while (x->forward[i] != nullptr && x->forward[i]->key < key)
while (x->forward[i] != nullptr && x->forward[i]->key < key) {
x = x->forward[i];
}
update[i] = x;
}
@@ -112,7 +114,7 @@ class SkipList {
}
std::shared_ptr<Node> n =
std::shared_ptr<Node>(new Node(key, rlevel, value));
std::make_shared<Node>(key, rlevel, value);
for (int i = 0; i <= rlevel; i++) {
n->forward[i] = update[i]->forward[i];
update[i]->forward[i] = n;
@@ -135,8 +137,9 @@ class SkipList {
update.fill(nullptr);
for (int i = level; i >= 0; i--) {
while (x->forward[i] != nullptr && x->forward[i]->key < key)
while (x->forward[i] != nullptr && x->forward[i]->key < key) {
x = x->forward[i];
}
update[i] = x;
}
@@ -146,8 +149,9 @@ class SkipList {
if (!doesnt_exist) {
for (int i = 0; i <= level; i++) {
if (update[i]->forward[i] != x)
if (update[i]->forward[i] != x) {
break;
}
update[i]->forward[i] = x->forward[i];
}
/* Remove empty levels*/