Insert 5 to Make Number Largest in Python

Suppose we have a number n, we have to find the maximum number we can make by inserting 5 anywhere in the number.

So, if the input is like n = 826, then the output will be 8526.

To solve this, we will follow these steps −

• temp := n as a string
• ans := -inf
• for i in range 0 to size of temp, do
  • cand := substring of temp from index 0 to i concatenate '5' concatenate substring of temp from index i to end
  • if i is same as 0 and temp[0] is same as '-', then
    • go for the next iteration
  • ans := maximum of ans, and the number cand
• return ans

Let us see the following implementation to get better understanding −

Example

 Live Demo

class Solution:
   def solve(self, n):
      temp = str(n)
      ans = float('-inf')
      for i in range(len(temp) + 1):
         cand = temp[:i] + '5' + temp[i:]
         if i == 0 and temp[0] == '-':
            continue
            ans = max(ans, int(cand))
      return ans
ob = Solution()
print(ob.solve(826))

Input

826

Output

8526

Arnab Chakraborty

Updated on: 23-Sep-2020

381 Views

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