SquareVerification | Topcoder Archive

Problem Statement

You have received an integer x from a transmission. Now the sender requests you to send him back a specific integer d obtained from x so that he could verify whether the transmission was correct. In order to find d, you first need to calculate y = x*x and then to find the largest digit of y in decimal notation.

Given an int x, return the value of d.

Definition

Class:: SquareVerification
Method:: calculateCode
Parameters:: int
Returns:: int
Method signature:: int calculateCode(int x)
(be sure your method is public)

Constraints

x will be between 1 and 10,000, inclusive.

Examples

```
2
```
```
Returns: 4
```
2*2 = 4. 4 contains only one digit : 4.
```
13
```
```
Returns: 9
```
13*13 = 169.
```
766
```
```
Returns: 8
```
```
777
```
```
Returns: 9
```
```
1111
```
```
Returns: 4
```

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