A solver about "Calculator: The Game" implemented by DFS
The code is in /ConsoleApp1/Program.cs
Links of "Calculator: The Game"
Android: https://play.google.com/store/apps/details?id=com.sm.calculateme&hl=en_GB
IOS: https://itunes.apple.com/us/app/calculator-the-game/id1243055750?mt=8