You default Android Studio directory should be C:\Program Files\Android\Android Studio.
If you are searching for the Android SDK location, check out here.
The warning/error you are getting on flutter doctor is telling you that he cannot find Android Studio in the path C:\Program, this means you will need to set it manually. To do it, run the following command(s) with the correct path.
flutter config --android-studio-dir "[YOURPATH]"
flutter config --android-sdk "[YOURPATH]"
This should be the expected output of the flutter doctor

Remember to use those " " to indicate the path of Android Studio, otherwise you'll have this output, that is not what we want: Setting "android-studio-dir" value to "C:\Program".