implementing mergesort()

Hi.
What's wrong with my implementation? My program just flashes............

Perhaps you should post your implementation if you think something is wrong with it. You might also want to look at the following:
http://www.cplusplus.com/forum/beginner/1988/
closed account (48T7M4Gy)
http://www.cplusplus.com/forum/general/177367/
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