ccoommmmiitt 33 iinn ccpppp

.vscode/settings.json

@@ -50,6 +50,7 @@
         "xtr1common": "cpp",
         "xutility": "cpp",
         "vector": "cpp",
-        "list": "cpp"
+        "list": "cpp",
+        "optional": "cpp"
     }
 }

2/linked list by hand.cpp

@@ -0,0 +1,156 @@
+#include <vector>
+#include <list>
+#include <iostream>
+#include <memory>
+#include <optional>
+
+class node
+{
+public:
+    int data;
+    std::unique_ptr<node> next;
+
+    node(int data) : data(data), next(nullptr) {}
+    node(int data, std::unique_ptr<node> next) : data(data), next(std::move(next)) {}
+    ~node() {}
+};
+class linked_list
+{
+public:
+    std::unique_ptr<node> head;
+    linked_list() : head(nullptr) {}
+
+    linked_list(std::vector<int> v) : head(nullptr)
+    {
+        for (int i : v)
+        {
+            append(i);
+        }
+    }
+
+    linked_list(std::initializer_list<int> v) : head(nullptr)
+    {
+        for (int i : v)
+        {
+            append(i);
+        }
+    }
+
+
+    void append(int x) // prepend
+    {
+        auto temp = std::make_unique<node>(x, std::move(head));
+        head = std::move(temp);
+    }
+    /// Pops the head of the linked list and returns the value in x.
+    ///
+    /// If the linked list is empty, returns false. Otherwise, returns true.
+    /// @param x The value popped from the linked list, if not empty.
+    /// @return true if a value was popped, false if the list was empty.
+    std::optional<int> pop()
+    {
+        if (!head)
+            return std::nullopt;
+        int value = head->data;
+        head = std::move(head->next);
+        return value;
+    }
+
+    /// Initialize a linked list with a vector of values
+    ///
+    /// The linked list is created by prepending each item in the vector
+    /// to the list in order. The resulting list is a linked list where
+    /// each node contains one item from the vector, and the order of the
+    /// items in the vector is preserved in the linked list.
+    linked_list &add(std::vector<int> &v)
+    {
+        for (int i : v)
+        {
+            append(i);
+        }
+        return *this;
+    }
+    node *tail() const
+    {
+        node *temp = head.get();
+        while (temp->next != nullptr)
+        {
+            temp = temp->next.get();
+        }
+        return temp;
+    }
+    linked_list &add(const linked_list &l)
+    {
+        std::vector<int> v = l.view();
+        while (v.size() > 0)
+        {
+            append(v.back());
+            v.pop_back();
+        }
+        // delete v?
+
+        return *this;
+    }
+    linked_list &add(std::initializer_list<int> l)
+    {
+        for (int i : l)
+        {
+            append(i);
+        }
+
+        return *this;
+    }
+    std::vector<int> view() const
+    {
+        std::vector<int> ret;
+        node *temp = head.get();
+        while (temp != nullptr)
+        {
+            ret.push_back(temp->data);
+            temp = temp->next.get();
+        }
+        return ret;
+    }
+    friend std::ostream &operator<<(std::ostream &os, const linked_list &list)
+    {
+        node *temp = list.head.get();
+        while (temp)
+        {
+            os << temp->data << " -> ";
+            temp = temp->next.get();
+        }
+        os << "nullptr";
+        return os;
+    }
+};
+
+int main(int argc, char const *argv[])
+{
+    linked_list l;
+    l.append(1);
+    l.append(2);
+    l.append(3);
+    l.append(4);
+    l.append(5);
+    std::cout << l << std::endl;
+    int x = l.pop().value();
+    std::cout << x << std::endl;
+    linked_list l2 = {6, 7, 8, 9};
+    l.add(l2);
+    l2.add({17, 18, 19, 20, 21});
+    std::cout << l2 << std::endl;
+    std::cout << l << std::endl;
+    std::vector v = l.view();
+    for (int i : v)
+    {
+        std::cout << i << " ";
+    }
+    std::cout << "\n";
+    v = l2.view();
+    for (int i : v)
+    {
+        std::cout << i << " ";
+    }
+    std::cout << "\n";
+    return 0;
+}

3/queue.cpp

@@ -7,25 +7,33 @@ private:
     int arr[cap];
     int front = 0;
     int back = 0;
-
-public:
     int size = 0;
 
-    void push(int x)
+public:
+    int get_size() { return size; }
+    /**
+     * Adds an element to the back of the queue.
+     *
+     * @param x The element to be added.
+     * @return Returns 0 if the element was successfully added, or 1 if the queue is full.
+     */
+    bool push(int x)
     {
         if (size == cap)
-            return;
+            return 1;
         arr[back] = x;
         back = (back + 1) % cap;
         size++;
+        return 0;
     }
-    void pop(int *put)
+    bool pop(int *put)
     {
         if (size == 0)
-            return;
+            return 1;
         *put = arr[front];
         front = (front + 1) % cap;
         size--;
+        return 0;
     }
     std::vector<int> view()
     {

3/stack.cpp

@@ -6,23 +6,29 @@ private:
     int top;
 
 public:
-    lda_stack() { top = 0; 
-    for (int i = 0; i < 60; i++) stack[i] = 0;
-    }
-    int push(int x)
+    lda_stack(): top(0) {}
+    bool push(int x)
     {
         if (top >= 60)
             return 1;
         stack[top++] = x;
         return 0;
     }
-    int pop(int *put)
+    bool pop(int *put)
     {
         if (top == 0)
             return 1;
         *put = stack[--top];
         return 0;
     }
+    bool peek(int *put)
+    {
+        if (top == 0)
+            return 1;
+        *put = stack[top - 1];
+        return 0;
+    }
+
     int size() { return top; } // top is the size of the stack, not the index
 };
 

5/binary_tree.cpp

@@ -1,102 +1,117 @@
 #include <iostream>
 #include <vector>
+#include <cmath>
 
-int log2int(int n){
-    if (n <= 1){
-        return 0; // no support + n is int anyway
-    }
-    return 1 + log2int(n / 2);
-}
 class binary_tree
 {
 public:
     binary_tree() {}
+
     void append(int x)
     {
         data.push_back(x);
-        maintain_shape(0);
+        bubble_up(data.size() - 1);
     }
-    void maintain_shape(int ind)
+
+    void add(std::vector<int> add)
     {
-        int left = 2 * ind + 1;
-        int right = 2 * ind + 2; // damn this is accounted for 0 indexing gj ai
-        if (left > data.size())
-        { // 100% leaf
-            return;
+        for (int x : add)
+        {
+            append(x);
         }
-        if (right > data.size())
-        { // only node is left, and that node is also last ele in data
-            if (data[ind] < data[left])
-            {
-                std::swap(data[ind], data[left]); // bigger higher
-            }
-            return;
-        }
-        maintain_shape(left);
-        maintain_shape(right);
-        // ordering? so the last item at index data.size() - 1 isnt swapped last: may lead to problem??? idk
-        if (data[ind] < data[left])
-            std::swap(data[ind], data[left]);
-        if (data[ind] < data[right])
-            std::swap(data[ind], data[right]);
     }
-    int pop() {
+
+    int pop()
+    {
+        if (data.empty())
+            throw std::runtime_error("Heap is empty");
         int ret = data[0];
-        data[0] = data[data.size() - 1];
+        data[0] = data.back();
         data.pop_back();
-        maintain_shape(0);
+        if (!data.empty())
+            sift_down(0);
         return ret;
     }
-    void add(std::vector<int> add) {
-        for (int i = 0; i < add.size(); i++) {
-            data.push_back(add[i]);
-        }
-        maintain_shape(0);
-    }
-    void print() {
-        // insane sauce:
-        int twos = 0;
 
-        for (int i = 0; i < data.size(); i++) {
-            if (log2int(i + 1) == twos + 1) {
-                std::cout << std::endl;
-                twos++;
+    void print()
+    {
+        int levels = 0;
+        for (int i = 0; i < data.size(); i++)
+        {
+            if (log2int(i + 1) == levels + 1)
+            {
+                std::cout << "\n";
+                levels++;
             }
             std::cout << data[i] << " ";
         }
-        std::cout << std::endl;
+        std::cout << "\n";
     }
+
 private:
     std::vector<int> data;
-};
 
+    int log2int(int n)
+    {
+        int log = 0;
+        while (n > 1)
+        {
+            n /= 2;
+            log++;
+        }
+        return log;
+    }
+
+    void bubble_up(int idx)
+    {
+        while (idx > 0)
+        {
+            int parent = (idx - 1) / 2;
+            if (data[parent] >= data[idx])
+                break;
+            std::swap(data[parent], data[idx]);
+            idx = parent;
+        }
+    }
+
+    void sift_down(int idx)
+    {
+        while (true)
+        {
+            int left = 2 * idx + 1;
+            int right = 2 * idx + 2;
+            int largest = idx;
+
+            if (left < data.size() && data[left] > data[largest])
+                largest = left;
+            if (right < data.size() && data[right] > data[largest])
+                largest = right;
+
+            if (largest == idx)
+                break;
+
+            std::swap(data[idx], data[largest]);
+            idx = largest;
+        }
+    }
+};
 
 int main(int argc, char const *argv[])
 {
     binary_tree bt;
-    bt.append(1);
-    bt.append(2);
-    bt.append(6);
-    std::cout << "\n";
-    bt.print();
-    bt.append(4);
+    bt.append(10);
+    bt.append(20);
     bt.append(5);
-    std::cout << "\n";
-    bt.print();
-    bt.append(9);
-    std::cout << "\n";
-    bt.print();
-    bt.append(8);
-    std::cout << "\n";
+    bt.append(6);
+    bt.append(15);
     bt.print();
+
     int popped = bt.pop();
-    std::cout << "popped: " << popped << std::endl;
+    std::cout << "Popped: " << popped << "\n";
     bt.print();
-    popped = bt.pop();
-    std::cout << "popped: " << popped << std::endl;
-    bt.print();
-    bt.add({6,5,11, 8, 10,15,3,7,1,12,4, 9});
-    std::cout << "\n";
+
+    bt.add({50, 40, 60});
     bt.print();
+
     return 0;
 }