OneDigitDifference | Topcoder Archive

Problem Statement

We say that two integer numbers differ from each other by one digit, when in their decimal notation, possibly with leading zeros, they will differ in exactly one position. For example numbers 128 and 28 differ by one digit:

But numbers 2047 and 40 differ by two digits:

Given the number N, find and return the smallest possible non-negative number M, such that number N and M differ from each other by exactly one digit.

Definition

Class:: OneDigitDifference
Method:: getSmallest
Parameters:: int
Returns:: int
Method signature:: int getSmallest(int N)
(be sure your method is public)

Constraints

N will be between 0 and 2,000,000,000, inclusive.

Examples

```
9
```
```
Returns: 0
```
0 is the smallest non-negative number and differs by only one digit.
```
0
```
```
Returns: 1
```
The result number is not always smaller than N.
```
900000123
```
```
Returns: 123
```
Leading zeros in the result are okay: 900000123 000000123
```
30000
```
```
Returns: 0
```
Leading zeros are okay also with 0 as a result: 30000 00000
```
47
```
```
Returns: 7
```
```
1907654321
```
```
Returns: 907654321
```

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