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📚 Introduction to Algorithms - LIIEEng01EIntroductionToAlgorithmic

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a = 5
b = 3
c = a
a = b
b = c
print(a, b)

What is the output of this script?

3 5

5 3

5 5

3 3

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Which of these for loops is written properly to calculate the sum of the 9 first squares?

sum_squares = 0
for i in range(9):
    sum_squares += i * 2

for j in range(1, 10):
    sum_squares = i * i

for i in range(1, 10):
    sum_squares += i * i
    i = i + 1

sum_squares = 0
for idx in range(0; 10; 1):
    sum_squares += i**2

sum_squares = 0
for i in range(1, 10):
    sum_squares += i * i

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Which of the following statements, about the conditionals, are true?

A conditional must always be have an else statement.

The body of a for loop (instruction that need to be repeated) must be indented (one tabulation to the right)

A conditional requires a colon ( : ) to signify the beginning of its body.

✅

The test of a conditional does not always have to be a boolean.

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How many times is the instruction

sum = sum + i * j

repeated in the following script?

sum = 0
for i in range(15, 3, -3):
    for j in range(-6, 6, 2):
        sum = sum + i * j

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How many times is the instruction

sum = sum + i

repeated in the following script?

sum = 0
for i in range(2, 10, 2):
    sum = sum + i

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Which of the following statements, about the for loops, are true?

The index needs to be created before the for loop.

❌

The body of a for loop (instruction that need to be repeated) must be indented (one tabulation to the right).

✅

A for loop requires a colon ( : ) to signify the beginning of its body.

✅

The index needs to be incremented (raised by a certain value after each repetition) inside the body of a for loop.

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A flag is a specific boolean variable meant to check if a certain condition is satisfied at least once in a loop.

Link each varaible to its type

var = str([int([1, "1", 1.0][1]), [True, 0][0], []][2])

var = [bool(1), [666, "Oskour"], [[[1.0]]]][2][0][0][0]

var = [int([1, "1", 1.0][1]), [True, 0][0], []][2]

var = [bool(1), [666, "Oskour"], [[[1.0]]]][2][0][0]

var = [bool(1), [666, "Oskour"], [[[1]]]][1][1]

var = [int([1, "1", 1.0][1]), [True, 0][0], []][1]

var = [int([1, "1", 1.0][1]), [True, 0][0], []][0]

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Link each varaible to its type.

var = "0.5"

var = 2 / 2

var = 0.5

var = 5

var = 1 / 2

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Which of these instruction asks an integer to the user and saves it in the variable var?

var = input(int("Enter a string:\t"))

var = int(input("Enter a float")

var = input(string("Enter a bool"))

var = input("Enter a list:\n")

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