Given a positive integer N, the task is to convert this integer to the maximum possible integer without leading zeroes by changing the digits. A digit X can only be changed into a digit Y if X + Y = 9.
Input: N = 42
Change 4 -> 5 and 2 -> 7.
Input: N = 1
Approach: Only the digits which are greater than or equal to 5 need to be changed as changing the digits which are less than 5 will result in a larger number. After all the required digits have been updated, check whether the resultant number has a leading zero, if yes then change it to a 9.
Below is the implementation of the above approach:
- Write a program to reverse digits of a number
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- Write an Efficient C Program to Reverse Bits of a Number
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