diff --git a/td/td3/include/deque.h b/td/td3/include/deque.h
index e93b7ba..c2e2bf7 100644
--- a/td/td3/include/deque.h
+++ b/td/td3/include/deque.h
@@ -19,7 +19,7 @@ public:
     void RemoveBack(void);
     void ShrinkToFit(void);
 private:
-    size_t _frontIndex;
+    int64_t _frontIndex;
 };
 
 template <class T>
@@ -59,7 +59,7 @@ Deque<T> Deque<T>::GetFront(void)
         throw "This Deque doesn't have front elements";
     Deque<T> returnDeque(this->_frontIndex+1);
     returnDeque._size = this->_frontIndex+1;
-    for(size_t i=0; i< this->_frontIndex+1 ; i++)
+    for(int64_t i=0; i< this->_frontIndex+1 ; i++)
         returnDeque._values[i] = this->_values[i];
     return returnDeque;
 }
diff --git a/td/td4/include/deque.h b/td/td4/include/deque.h
new file mode 100644
index 0000000..c2e2bf7
--- /dev/null
+++ b/td/td4/include/deque.h
@@ -0,0 +1,104 @@
+#ifndef HEADER_DEQUE
+#define HEADER_DEQUE
+
+#include "vector.h"
+#include <algorithm>
+#include <iostream>
+
+template <class T>
+class Deque : public Vector<T> {
+public:
+    Deque() : Vector<T>(), _frontIndex(-1) {};
+    Deque(size_t capacity): Vector<T>(capacity), _frontIndex(-1) {};
+    Deque(size_t capacity, T value): Vector<T>(capacity,value), _frontIndex(-1) {};
+    Deque(const Vector<T>& other) : Vector<T>(other), _frontIndex(-1) {};
+    void PushFront(T value);
+    Deque<T> GetFront(void);
+    Deque<T> GetBack(void);
+    void RemoveFront(void);
+    void RemoveBack(void);
+    void ShrinkToFit(void);
+private:
+    int64_t _frontIndex;
+};
+
+template <class T>
+void Deque<T>::PushFront(T value)
+{
+    // if the next size will overload the heap
+    // We create a new allocation, and shift each data
+    if (this->_capacity < this->_size + 1) {
+        auto oldPtr = this->_values;
+        this->_values = new T[this->_size * 2];
+        this->_capacity *= 2;
+        for (size_t i = 0; i < this->_size; i++)
+            this->_values[i+1] = oldPtr[i];
+        delete[] oldPtr;
+    }
+    // Else we only shift the data
+    else{
+        // _values[0] will be overwritten, so it serves as a temporary value
+        // To store the overwritten index
+        auto tempActual(this->_values[0]);
+        for(size_t i=0; i< this->_size ; i++)
+        {
+            this->_values[0] = this->_values[i+1];
+            this->_values[i+1] = tempActual;
+            tempActual = this->_values[0];
+        }
+    }
+    this->_values[0] = value;
+    this->_size++;
+    _frontIndex++;
+}
+
+template <class T>
+Deque<T> Deque<T>::GetFront(void)
+{
+    if(this->_frontIndex == -1)
+        throw "This Deque doesn't have front elements";
+    Deque<T> returnDeque(this->_frontIndex+1);
+    returnDeque._size = this->_frontIndex+1;
+    for(int64_t i=0; i< this->_frontIndex+1 ; i++)
+        returnDeque._values[i] = this->_values[i];
+    return returnDeque;
+}
+
+template <class T>
+Deque<T> Deque<T>::GetBack(void)
+{
+    Deque<T> returnDeque(this->_size-(this->_frontIndex+1));
+    returnDeque._size = this->_size-(this->_frontIndex+1);
+    for(size_t i = this->_frontIndex+1, j=0 ; i<this->_size ; i++, j++)
+        returnDeque._values[j] = this->_values[i];
+    return returnDeque;
+}
+
+template <class T>
+void Deque<T>::RemoveFront(void)
+{
+    for(size_t i = this->_frontIndex+1, j=0 ; i<this->_size ; i++, j++)
+        this->_values[j] = this->_values[i];
+    this->_size -= (this->_frontIndex+1);
+    this->_frontIndex = -1;
+}
+
+// The Capacity is not shrunk during this process.
+template <class T>
+void Deque<T>::RemoveBack(void)
+{
+    this->_size = this->_frontIndex+1;
+}
+
+template <class T>
+void Deque<T>::ShrinkToFit(void)
+{
+    auto oldPtr = this->_values;
+    this->_values = new T[this->_size];
+    for(size_t i=0; i<this->_size; i++)
+        this->_values[i] = oldPtr[i];
+    delete[] oldPtr;
+    this->_capacity = this->_size;
+}
+
+#endif //HEADER_DEQUE
\ No newline at end of file
diff --git a/td/td4/include/smart_vector.h b/td/td4/include/smart_vector.h
new file mode 100644
index 0000000..fd60fd0
--- /dev/null
+++ b/td/td4/include/smart_vector.h
@@ -0,0 +1,47 @@
+#ifndef HEADER_SMART_VECTOR
+#define HEADER_SMART_VECTOR
+
+#include "vector.h"
+#include <algorithm>
+
+template <class T>
+class Smart_Vector : public Vector<T> {
+public:
+    Smart_Vector() : Vector<T>() {};
+    Smart_Vector(size_t capacity): Vector<T>(capacity) {};
+    Smart_Vector(size_t capacity, T value): Vector<T>(capacity,value) {};
+    Smart_Vector(const Vector<T>& other) : Vector<T>(other) {};
+    Smart_Vector<T> operator+(const Smart_Vector<T>& other);
+    Smart_Vector<T>& operator+=(const Smart_Vector<T>& other);
+};
+
+template <class T>
+Smart_Vector<T> Smart_Vector<T>::operator+(const Smart_Vector<T>& other)
+{
+    // Gathering the vector with the greater size.
+    auto& maxVector = (this->_size > other._size ? *this : other);
+    Smart_Vector<T> returnVector(maxVector._size);
+    returnVector._size = returnVector._capacity;
+    size_t i(0);
+
+    // Adding both vectors from 0 to the minimum size
+    for(i=0; i<std::min(this->_size,other._size); i++)
+        returnVector._values[i] = this->_values[i] + other._values[i];
+    // Then simply copying the max vector values onto the return vector.
+    for(size_t j=i; j<returnVector._size; j++)
+        returnVector._values[j] = maxVector._values[j];
+    return returnVector;
+}
+
+template <class T>
+Smart_Vector<T>& Smart_Vector<T>::operator+=(const Smart_Vector<T>& other)
+{
+    size_t i(0), minimumSize(std::min(this->_size,other._size));
+    for(i = 0; i<minimumSize ; i++)
+        this->_values[i] += other._values[i];
+    for(size_t j=i; j<other._size ; j++)
+        this->PushBack(other._values[j]);
+    return *this;
+}
+
+#endif // HEADER_SMART_VECTOR
\ No newline at end of file
diff --git a/td/td4/include/vector.h b/td/td4/include/vector.h
new file mode 100644
index 0000000..8a68376
--- /dev/null
+++ b/td/td4/include/vector.h
@@ -0,0 +1,179 @@
+#ifndef HEADER_VECTOR
+#define HEADER_VECTOR
+
+#include <cstddef>
+#include <ostream>
+
+template <class T>
+class Vector {
+public:
+    Vector();
+    Vector(size_t capacity);
+    Vector(size_t capacity, T value);
+    Vector(const Vector<T>& other);
+    ~Vector();
+    size_t Size();
+    size_t Capacity();
+    void PushBack(T value);
+    template <class Tfriend>
+    friend std::ostream& operator<<(std::ostream& stream, const Vector<Tfriend>& vec);
+    template <class Tfriend>
+    friend std::istream& operator>>(std::istream& stream, Vector<Tfriend>& vec);
+    Vector<T>& operator=(const Vector<T>& other);
+    Vector<T>& operator()(const Vector<T>& other);
+    T& operator[](const int indice);
+    Vector<T> operator+(const Vector<T>& other);
+    Vector<T>& operator+=(const Vector<T>& other);
+
+protected:
+    size_t _capacity;
+    size_t _size;
+    T* _values;
+};
+
+template <class T>
+Vector<T>::Vector()
+    : _capacity(1)
+    , _size(0)
+    , _values(new T[1])
+{
+}
+
+template <class T>
+Vector<T>::Vector(size_t capacity)
+    : _capacity(capacity)
+    , _size(0)
+{
+    // Allocating the heap with the given capacity
+    _values = new T[capacity];
+}
+
+template <class T>
+Vector<T>::Vector(size_t capacity, T value)
+    : _capacity(capacity)
+    , _size(capacity)
+{
+    // Allocating the heap and setting the value to each element.
+    _values = new T[capacity];
+    for (size_t i = 0; i < capacity; i++)
+        _values[i] = value;
+}
+
+template <class T>
+Vector<T>::Vector(const Vector& other)
+    : _capacity(other._capacity)
+    , _size(other._size)
+    , _values(new T[other._capacity])
+{
+    for (size_t i = 0; i < other._size; i++)
+        _values[i] = other._values[i];
+}
+
+template <class T>
+Vector<T>::~Vector()
+{
+    delete[] _values;
+}
+
+template <class T>
+Vector<T>& Vector<T>::operator=(const Vector<T>& other)
+{
+    if (this != &other) {
+        this->_capacity = other._capacity;
+        this->_size = other._size;
+        delete[] this->_values;
+        this->_values = new T[other._capacity];
+        for (size_t i = 0; i < other._size; i++)
+            this->_values[i] = other._values[i];
+    }
+    return *this;
+}
+
+template <class T>
+Vector<T>& Vector<T>::operator()(const Vector<T>& other)
+{
+    *this = other;
+    return *this;
+}
+
+template <class T>
+size_t Vector<T>::Capacity() { return _capacity; }
+template <class T>
+size_t Vector<T>::Size() { return _size; }
+
+template <class T>
+void Vector<T>::PushBack(T value)
+{
+    // if the next size will overload the heap
+    if (_capacity < _size + 1) {
+        // Keep a track of the old pointer
+        T* oldPtr = _values;
+        // Creating a new pointer by resizing its capacity by factor 2.
+        _values = new T[_size * 2];
+        _capacity *= 2;
+        // Copying the old array onto the new
+        for (size_t i = 0; i < _size; i++)
+            _values[i] = oldPtr[i];
+        // Deallocating the old array
+        delete[] oldPtr;
+    }
+    // Setting the given value and incrementing the size
+    _values[_size] = value;
+    _size++;
+}
+
+// methode get
+template <class T>
+std::ostream& operator<<(std::ostream& stream, const Vector<T>& vec)
+{
+    for (size_t i = 0; i < vec._size; i++)
+        stream << vec._values[i] << ", ";
+    return stream;
+}
+
+// methode put
+template <class T>
+std::istream& operator>>(std::istream& stream, Vector<T>& vec)
+{
+    for (size_t i = 0; i < vec._capacity; i++)
+        stream >> vec._values[i];
+    vec._size = vec._capacity;
+    return stream;
+}
+
+template <class T>
+T& Vector<T>::operator[](const int indice)
+{
+    if (static_cast<size_t>(indice) > _size)
+        throw "Indice from the vector is not reachable";
+    else
+        return _values[indice];
+}
+
+template <class T>
+Vector<T> Vector<T>::operator+(const Vector<T>& other)
+{
+    if (_size != other._size)
+        throw "Cannot add two vectors with different sizes together";
+    else {
+        Vector<T> returnVector(_size);
+        returnVector._size = _size;
+        for (size_t i = 0; i < _size; i++)
+            returnVector._values[i] = _values[i] + other._values[i];
+        return returnVector;
+    }
+}
+
+template <class T>
+Vector<T>& Vector<T>::operator+=(const Vector<T>& other)
+{
+    if (_size != other._size)
+        throw "Cannot add two vectors with different sizes together";
+    else {
+        for (size_t i = 0; i < _size; i++)
+            _values[i] += other._values[i];
+        return *this;
+    }
+}
+
+#endif // HEADER_VECTOR
\ No newline at end of file
diff --git a/td/td4/src/main.cpp b/td/td4/src/main.cpp
new file mode 100644
index 0000000..d6db6b9
--- /dev/null
+++ b/td/td4/src/main.cpp
@@ -0,0 +1,50 @@
+#include "../include/vector.h"
+#include "../include/smart_vector.h"
+#include "../include/deque.h"
+// Joker : slice.h
+// Joker : vector_iteraor.h
+#include <iostream>
+
+int main(void)
+{
+    Smart_Vector<int> smartInt, test(10,6);
+    for(int i=0; i<6; i++)
+        smartInt.PushBack(i);
+
+    std::cout << smartInt << std::endl;
+    std::cout << test << std::endl; 
+
+    std::cout << smartInt + test << std::endl;
+    std::cout << smartInt + smartInt << std::endl;
+
+    Smart_Vector<int> little(5,1), big(10,5);
+    little += big;
+    std::cout << little << std::endl;
+    little = Smart_Vector<int>(5,1);
+    big += little;
+    std::cout << big << std::endl;
+
+    // Deque test
+    Deque<int> dequeInt;
+    for(int i=0; i<6; i++)
+        dequeInt.PushBack(i);
+    std::cout << "Deque push back: " << dequeInt << std::endl;
+    for(int i=1; i<=6; i++)
+        dequeInt.PushFront(i*10);
+    std::cout << "Deque push front: " << dequeInt << std::endl;
+    std::cout << "End capacity: " << dequeInt.Capacity() << std::endl;
+
+    std::cout << "Deque Front Elements: " << dequeInt.GetFront() << std::endl;
+    std::cout << "Deque Back Elements: " << dequeInt.GetBack() << std::endl;
+    dequeInt.RemoveBack();
+    std::cout << "After Removing Back: " << dequeInt << std::endl;
+    dequeInt.PushBack(56);
+    std::cout << "Pushing Back again: " << dequeInt << std::endl;
+    dequeInt.RemoveFront();
+    std::cout << "After Removing Front: " << dequeInt << std::endl;
+    dequeInt.PushFront(10);
+    std::cout << "Front: " << dequeInt.GetFront() << "\tBack: " << dequeInt.GetBack() << "\tFull Deque: " << dequeInt << "\tWith Capacity: " << dequeInt.Capacity() << std::endl;
+    dequeInt.ShrinkToFit();
+    std::cout << "After ShrinkToFit: " << dequeInt.Capacity() << "\tWith: " << dequeInt << std::endl;
+    return 0;
+}
\ No newline at end of file