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Thanks for all your help.

I used an iterative method to fill rectangles and didn't notice the situations when x>m or y>n. After fixed the little bug, I got AC.

The input seems to be regular, not too tricky, I think. When you are crazy about your countless WA's, just pay attention to the fill part.

Thanks. I just made a mistake with the calculation of average. With your help, I got AC.

Actually I find my fault with the programming-challenges judge than with this judge. I had failed attempts with LC-Display(110104/706) and WERTYU(110301/10082) in which both got P.E. and W.A. respectively in ...

I passed 164 but failed at this problem. I generated some test data, followed by output. The output was checked by a program(by me), which is performing these operations on the input string and sees if the result is expected. I've no idea what's wrong with the program.

Any suggestions would help ...

I tried to solve this problem using the long long type but failed. Well, when I shifted long long type to double type, I got it accepted. I'm wondering, why long long type gives out the incorrect answers?