write a program to find the largest and the second largest elements in a given list of elements.
Answers
Answer:
Examples:
Input: list1 = [10, 20, 4]
Output: 10
Input: list2 = [70, 11, 20, 4, 100]
Output: 70
Method 1: Sorting is an easier but less optimal method. Given below is an O(n) algorithm to do the same.
# Python program to find second largest
# number in a list
# list of numbers - length of
# list should be at least 2
list1 = [10, 20, 4, 45, 99]
mx=max(list1[0],list1[1])
secondmax=min(list1[0],list1[1])
n =len(list1)
for i in range(2,n):
if list1[i]>mx:
secondmax=mx
mx=list1[i]
elif list1[i]>secondmax and \
mx != list1[i]:
secondmax=list1[i]
print("Second highest number is : ",\
str(secondmax))
Output
Second highest number is : 45
Method 2: Sort the list in ascending order and print the second last element in the list.
# Python program to find largest
# number in a list
# list of numbers
list1 = [10, 20, 4, 45, 99]
# sorting the list
list1.sort()
# printing the second last element
print("Second largest element is:", list1[-2])
Output
Second largest element is: 45
Method 3: By removing the max element from the list
# Python program to find second largest
# number in a list
# list of numbers
list1 = [10, 20, 4, 45, 99]
# new_list is a set of list1
new_list = set(list1)
# removing the largest element from temp list
new_list.remove(max(new_list))
# elements in original list are not changed
# print(list1)
print(max(new_list))
Output
45
Method 4: Find max list element on inputs provided by the user
# Python program to find second largest
# number in a list
# creating empty list
list1 = []
# asking number of elements to put in list
num = int(input("Enter number of elements in list: "))
# iterating till num to append elements in list
for i in range(1, num + 1):
ele = int(input("Enter elements: "))
list1.append(ele)
'''
# sort the list
list1.sort()
# print second maximum element
print("Second largest element is:", list1[-2])
'''
# print second maximum element using sorted() method
print("Second largest element is:", sorted(list1)[-2])
Output:
Enter number of elements in list: 4
Enter elements: 12
Enter elements: 19
Enter elements: 1
Enter elements: 99
Second Largest element is: 19
Explanation:
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