Day 2 Task:
→ Find Numbers with Even Number of Digits:
Solutions:
Please review all the solutions and try implementing on your own if you haven’t gotten it.
class Solution:
# Go through each number in the array, (decimal) divide it by 10
# at each iteration till it's 0
# So we get the number of digits(c), check if number of digits
# are divisible by 2.
# If so, increment the even digits counter(k) by 1.
def findNumbers(self, nums: List[int]) -> int:
c=0
k=0
for i in nums:
num=i
while(num>0):
num=num//10
c=c+1
if(c%2==0):
k=k+1
c=0
return k # Solution 2
# Check if the number is between the even digits numbers.
class Solution:
def findNumbers(self, nums: List[int]) -> int:
k=0
for i in nums:
if(i>=10 and i<=99):
k=k+1
elif(i>=1000 and i<=9999):
k=k+1
elif(i>=100000 and i<=999999):
k=k+1
return k
# Solution 3
# Converting the number into string and checking the length of the
# string is divisible by 2
# If so, it's an even number.
class Solution:
def findNumbers(self, nums: List[int]) -> int:
k=0
for i in range(len(nums)):
if(len(str(nums[i])) % 2 == 0):
k=k+1
return k