The beavers are painting pictures, made of different shapes, on a computer.海狸们正在电脑上绘制由不同形状组成的图画。
They can paint any shape by selecting one of four colors and then clicking on the shape.他们可以通过选择四种颜色中的一种，然后点击形状来给任何形状上色。
Example:例子：
The beavers could paint the 'face' 
completely blue with just two moves: 海狸只需两步就能把“脸”完全涂成蓝色：
- Select yellow, paint the red part to get: 选择黄色，将红色部分涂成黄色得到：
- Then select blue, paint the yellow part to get: 然后选择蓝色，将黄色部分涂成蓝色，得到：
Task 任务:
Make the pattern below completely green with the fewest number of moves possible.
(Press 'Save' when you have finished.)（完成后请按“保存”。）用尽可能少的步数将下面的图案全部涂成绿色。
Explanation 解释
Answer: 答案:
The picture can be painted completely green in three moves.这幅画可以在三步之内全部涂成绿色。
Explanation: 解释:
The initial drawing contains four colours. Only one colour can be repainted by a single filling.最初的图画包含四种颜色。每次填充只能重新绘制一种颜色。
So the minimum number of moves is three.所以最少需要移动三次。
- Yellow to blue: we got rid of the yellow colour and got a single blue part.从黄色到蓝色：我们去掉了黄色，得到了一个单独的蓝色部分。
- Blue to red: we made one single red part.从蓝色到红色：我们制作了一个单独的红色部件。
- Red to green: we are done!从红到绿：我们完成了！
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