# ================================================
#  Sujet 3.
# ================================================

import time

def experience1():
    N = 10000

    A = [[1 for _ in range(N)] for _ in range(N)]
    start = time.time()
    for i in range(N):
        for j in range(N):
            A[i][j] += 1
    stop = time.time()
    print("Temps V1: ", stop - start)

    A = [[1 for _ in range(N)] for _ in range(N)]
    start = time.time()
    for i in range(N):
        for j in range(N):
            A[j][i] += 1
    stop = time.time()
    print("Temps V2: ", stop - start)

def experience2():
    def grapheVide(n):
        return [[]] * n

    g = grapheVide(6)
    g[0].append(1)

    print("(g[5]==[]):", g[5]==[])

def experience3():
    un_dixieme    = 1/10
    trois_dixieme = 3/10

    print("un_dixieme:", un_dixieme)
    print("trois_dixieme:", trois_dixieme)
    print("(3 * un_dixieme == trois_dixieme):", 3 * un_dixieme == trois_dixieme)

def experience4():
    strange_number = 1e+308 # Rappel: "e+X" est une syntaxe pour "*10^X"
    print("(sn != sn * 2 / 2):", strange_number != strange_number * 2 / 2)

def experience5():
    strange_number = 1e+308
    print("(10^1000 < 2 * sn):", 10 ** 1000 < 2 * strange_number)