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1. What does this program print? ``

python
a = [4, 2, 7, 1, 3]
k = 2
window = sum(a[:k])
best = window
for i in range(k, len(a)):
    window += a[i]
    window -= a[i - k]
    best = max(best, window)
print(best)

``

6498

2. What does this program print? ``

python
a = [2, 1, 3, 1, 1, 4]
limit = 6
left = 0
total = 0
best_length = 0
best_start = 0
for right in range(len(a)):
    total += a[right]
    while total > limit:
        total -= a[left]
        left += 1
    length = right - left + 1
    if length > best_length:
        best_length = length
        best_start = left
print(best_length, "at", best_start)

``

4 at 13 at 05 at 04 at 3

3. What does this program print? ``

python
a = [2, 2, 1, 3, 0, 3]
k = 2
window = sum(a[:k])
best_sum = window
best_start = 0
for i in range(k, len(a)):
    window += a[i]
    window -= a[i - k]
    start = i - k + 1
    if window > best_sum:
        best_sum = window
        best_start = start
print(best_start, best_sum)

``

2 44 31 30 4

4. The program below should subtract the value that leaves the window, but it has no check for the first steps. What is the first line it prints? ``

python
a = [2, 1, 5, 1, 3, 2]
k = 3
window = 0
for i in range(len(a)):
    window += a[i]
    window -= a[i - k]
    print(i, window)

``

0 22 -10 10 0

5. Which window does this code never check? ``

python
a = [2, 1, 5, 1, 3, 2]
k = 3
for start in range(len(a) - k):
    print(start, sum(a[start:start + k]))

``

The window at index 2, values 5, 1, 3No window is skipped, the loop is correctThe window at index 0, values 2, 1, 5The window at index 3, values 1, 3, 2

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