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diff --git a/recursivite/exercice_MJoannic/dichotomie/recursif/correction/V1.py b/high-school/recursivite/exercice_MJoannic/dichotomie/recursif/correction/V1.py
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diff --git a/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/main.py b/high-school/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/main.py
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diff --git a/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/sort_list.py b/high-school/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/sort_list.py
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diff --git a/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/tester.py b/high-school/recursivite/exercice_MJoannic/dichotomie/recursif/myself/idx/tester.py
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diff --git a/recursivite/exercice_MJoannic/dichotomie/recursif/myself/tester.py b/high-school/recursivite/exercice_MJoannic/dichotomie/recursif/myself/tester.py
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diff --git a/recursivite/exercice_MJoannic/palindrom.py b/high-school/recursivite/exercice_MJoannic/palindrom.py
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diff --git a/trees/AB/arbre.py b/high-school/trees/AB/arbre.py
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diff --git a/university/4.2.2.py b/university/4.2.2.py
new file mode 100644
index 0000000..ad14dfc
--- /dev/null
+++ b/university/4.2.2.py
@@ -0,0 +1,62 @@
+import random as rng
+
+
+def random_int(start: int, end: int) -> int:
+    return rng.randint(start, end)
+
+
+start = 0
+end = 100
+number = random_int(start, end)
+
+
+def is_number(guess) -> int:
+    if number == guess:
+        return 0
+    elif number < guess:
+        return 1
+    else:
+        return -1
+
+
+def dumb_ai(start: int, end: int) -> int:
+    tries = 0
+    while True:
+        guess = rng.randint(start, end)
+        tries += 1
+        if is_number(guess) == 0:
+            return tries
+
+
+def guess_number(start: int, end: int) -> int:
+    tries = 0
+    while True:
+        guess = (start + end) // 2
+
+        tries += 1
+        hint = is_number(guess)
+        if hint == 0:
+            return tries
+        elif hint == -1:
+            start = guess + 1
+        else:
+            end = guess - 1
+
+
+def main(start, end) -> int:
+    print(f"Number to guess: {number}")
+    return guess_number(start, end)
+
+
+if __name__ == "__main__":
+    n = int(input("Number of games: "))
+    tries_global = list()
+    for _ in range(n):
+        tries_smart = main(start, end)
+        tries_dumb = dumb_ai(start, end)
+        print(tries_dumb, tries_smart)
+        print("*" * tries_smart)
+        print("-" * tries_dumb)
+        tries_global.append(tries_smart)
+
+    print(f"{sum(tries_global) / len(tries_global)}")
diff --git a/university/4.2.3.py b/university/4.2.3.py
new file mode 100644
index 0000000..c23aca1
--- /dev/null
+++ b/university/4.2.3.py
@@ -0,0 +1,76 @@
+import random
+import matplotlib.pyplot as plt
+
+LOW, HIGH = 0, 100
+N_VALUES = HIGH - LOW + 1
+N_TRIALS = 1000
+
+
+def smart_ai(secret, low=LOW, high=HIGH):
+    c = 0
+    lo, hi = low, high
+    while lo <= hi:
+        c += 1
+        mid = (lo + hi) // 2
+        if mid == secret:
+            return c
+        elif mid < secret:
+            lo = mid + 1
+        else:
+            hi = mid - 1
+    return c
+
+
+def dumb_ai(secret, low=LOW, high=HIGH):
+    c = 0
+    remaining = list(range(low, high + 1))
+    while True:
+        c += 1
+        g = random.choice(remaining)
+        if g == secret:
+            return c
+        remaining.remove(g)
+
+
+def simulate(n_trials=N_TRIALS):
+    means_smart = []
+    means_dumb = []
+    for secret in range(LOW, HIGH + 1):
+        s_sum = 0
+        d_sum = 0
+        for _ in range(n_trials):
+            s_sum += smart_ai(secret)
+            d_sum += dumb_ai(secret)
+        means_smart.append(s_sum / n_trials)
+        means_dumb.append(d_sum / n_trials)
+    return means_smart, means_dumb
+
+
+def print_text_hist(means_smart, means_dumb):
+    for i, (ms, md) in enumerate(zip(means_smart, means_dumb)):
+        print(f"[{i}] " + "*" * int(round(ms)))
+        print(f"[{i}] " + "-" * int(round(md)))
+
+
+def plot_curves(means_smart, means_dumb):
+    x = list(range(LOW, HIGH + 1))
+    plt.figure(figsize=(10, 5))
+    plt.plot(x, means_smart, label="IA intelligente (dichotomie)")
+    plt.plot(x, means_dumb, label="IA aléatoire (sans remise)")
+    plt.xlabel("Nombre secret")
+    plt.ylabel("Nombre moyen d'essais")
+    plt.title(
+        f"Moyenne des essais pour chaque nombre secret ({N_TRIALS} parties/valeur)"
+    )
+    plt.legend()
+    plt.grid(True)
+    plt.tight_layout()
+    plt.show()
+
+
+if __name__ == "__main__":
+    means_smart, means_dumb = simulate()
+    print_text_hist(means_smart, means_dumb)
+    plot_curves(means_smart, means_dumb)
+    print(f"Moyenne globale IA intelligente ≈ {sum(means_smart) / N_VALUES:.2f}")
+    print(f"Moyenne globale IA aléatoire ≈ {sum(means_dumb) / N_VALUES:.2f}")
diff --git a/university/4.2.py b/university/4.2.py
new file mode 100644
index 0000000..3f9078f
--- /dev/null
+++ b/university/4.2.py
@@ -0,0 +1,44 @@
+import random as rng
+
+
+def create_number(start: int, end: int) -> int:
+    return rng.randint(start, end)
+
+
+def main_part(start: int, end: int, max_tries: int) -> (bool, int):
+    number_to_guess = create_number(start, end)
+    guess = int(input("Entrez votre nombre: "))
+    tries = 1
+    while guess != number_to_guess and tries < max_tries:
+        if guess < number_to_guess:
+            print(f"{guess} est trop petit")
+            start = max(guess, start)
+        else:
+            print(f"{guess} est trop grand")
+            end = min(guess, end)
+        tries += 1
+        guess = int(input(f"Entrez votre nombre [{start};{end}]: "))
+
+    if guess == number_to_guess:
+        print(
+            f"Félicitation vous avez correctement deviner le nombre {number_to_guess} au bout de {tries}"
+        )
+        return True, tries
+    else:
+        print("Perdu")
+        return False
+
+
+if __name__ == "__main__":
+    start = 0
+    end = 100
+    max_tries = 5
+    again = True
+    played_game = 1
+    game_won = 0
+    stats = []
+    while again:
+        game = main_part(start, end, max_tries)
+        game_won += 1 if game[0] else 0
+        stats.append(game[1])
+        again = "y" == input("Voulez vous recommencez ? (y/n)")
diff --git a/university/fibibi.py b/university/fibibi.py
new file mode 100644
index 0000000..c3a2b0a
--- /dev/null
+++ b/university/fibibi.py
@@ -0,0 +1,48 @@
+def fibo(n: int, mem=None) -> int:
+    if mem is None:
+        mem = {}
+    if n <= 1:
+        return n
+    if n in mem:
+        return mem[n]
+    mem[n] = fibo(n - 1, mem) + fibo(n - 2, mem)
+    return mem[n]
+
+
+memo = {1: [1]}
+
+
+def syracuse(n):
+    if n in memo:
+        return memo[n]
+    if n % 2 == 0:
+        seq = [n] + syracuse(n // 2)
+    else:
+        seq = [n] + syracuse(3 * n + 1)
+    memo[n] = seq
+    return seq
+
+
+if __name__ == "__main__":
+    import time
+
+    n = int(input("n: "))
+    start = time.time()
+    print(fibo(n))
+    print(len(str((fibo(n)))))
+    end = time.time()
+    print(end - start)
+
+
+def fibo_fast(n: int) -> int:
+    def _fd(k: int) -> tuple[int, int]:
+        if k == 0:
+            return (0, 1)
+        a, b = _fd(k // 2)
+        c = a * ((b << 1) - a)
+        d = a * a + b * b
+        if k & 1:
+            return (d, c + d)
+        return (c, d)
+
+    return _fd(n)[0]