Python Lists - Solutions

🔢 Exercise 1: Access by Index

python
# Input: 10 20 30 40 50
arr = list(map(int, input("Enter elements: ").split(" ")))
index = int(input("Enter index: "))

print(arr[index])

🔢 Exercise 2: Count Equal to Last

python
# Input: 5 3 5 7 5 5
arr = list(map(int, input("Enter elements: ").split(" ")))
last = arr[-1]

count = 0
for num in arr:
    if num == last:
        count += 1
print(count)

🔢 Exercise 3: Elements Greater than Average

python
# Input: 10 20 30 40 50
arr = list(map(int, input("Enter elements: ").split(" ")))

average = sum(arr) / len(arr)
print(f"Average: {average}")

print("Elements greater than average:")
for num in arr:
    if num > average:
        print(num)

🔢 Exercise 4: Find Maximum and Its Position

python
# Input: 15 42 8 23
arr = list(map(int, input("Enter elements: ").split(" ")))

max_value = arr[0]
max_index = 0

# Loop through list (starting from index 1)
for i in range(1, len(arr)):
    if arr[i] > max_value:
        max_value = arr[i]
        max_index = i

print(f"Maximum value: {max_value}")
print(f"Index: {max_index}")

🔢 Exercise 5: Reverse the List

python
# Input: 1 2 3 4 5
arr = list(map(int, input("Enter elements: ").split(" ")))

# Iterate backwards from last index to 0
for i in range(len(arr) - 1, -1, -1):
    print(arr[i], end=" ")

🔢 Exercise 6: Count Occurrences

python
# Input: 3 5 3 7 3 8 3
arr = list(map(int, input("Enter elements: ").split(" ")))
target = int(input("Enter target: "))

count = 0
for num in arr:
    if num == target:
        count += 1

print(count)

🔢 Exercise 7: Even and Odd Separation

python
# Input: 12 7 8 15 4 9
arr = list(map(int, input("Enter elements: ").split(" ")))

even = []
odd = []
for num in arr:
    if num % 2 == 0:
        even.append(num)
    else:
        odd.append(num)

print(f"Even: {even}")
print(f"Odd: {odd}")

🔢 Exercise 8: Remove Duplicates

python
# Input: 5 3 5 7 3 8 5
arr = list(map(int, input("Enter elements: ").split(" ")))

unique = []
for num in arr:
    if num not in unique:
        unique.append(num)

print(f"Unique: {unique}")

🔢 Exercise 9: Sum of Two Adjacent Elements

python
# Input: 10 20 30 40
arr = list(map(int, input("Enter elements: ").split(" ")))

result = []
for i in range(len(arr) - 1):
    sum_adjacent = arr[i] + arr[i+1]
    result.append(sum_adjacent)

print(result)

🔢 Exercise 10: Find Second Largest

python
# Input: 45 23 67 12 89
arr = list(map(int, input("Enter elements: ").split(" ")))

arr.sort()
# Second largest is at index len(arr) - 2
second_largest = arr[len(arr) - 2]
print(second_largest)