Help needed in CHECHOC

https://www.codechef.com/viewsolution/36001072

Please help me out. I have checked a lot of test cases (including edge cases), the answer for all are same as the accepted solution. Why was my solution not accepted (WA)?

if m == 1 and n == 1: 
    if y < x:
        print(y)

Why? There is only one cell. And even if y < x, you can keep x candies in that cell. It does not violate sum of adjacent cells constraint.

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Thank you so much…

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