Given an odd number in the form of a string, the task is to make largest even number from the given number and you are allowed to do only one swap operation.
Input : 1235785 Output :1535782 Swap 2 and 5. Input : 536425 Output : 536524 Swap 4 and 5 to make the largest even number.
- Find the first even number less than or equal to the odd number at last index.
- If found, swap both values. Else swap with the last even value in the string.
- If not possible to make even, print the given string.
Time Complexity : O(N)
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