# WA in Chefword

Here’s a link to my solution : http://www.codechef.com/viewsolution/5440351
I don’t understand where i am going wrong …is it the double or some other precision thing i am missing ??

I’m not a C/C++ guru, but what is `ans.a[i][j]=double(i==j);` doing?

See my test case on ideone - http://ideone.com/pgtqzj

actually u are not giving a valid input …
the condition clearly states Sum of ai,1+…ai,n = 1
but the sum of all probabilities in the first row of your testcase is 3.
ans.a[i][j]=double(i==j); is for making an identity matrix.

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Ok I thought so (`double(i==j)`), hopefully it’s better now, those two ones was an error… Still printing 0.75, I’d expect 0.25, hopefully input is ok now…

But why 0.25 : two cases arise here:

1. a -> a -> a =0.5 x 0.5 = 0.25
2. a->b->a =0.5 x 1=0.5
total 0.75…right??
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Of course, my bad, I’ll get back with better test case

Ok, now - http://ideone.com/pgtqzj it was not so easy…

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@betlista… thanka a lot… it was the hashing problem…it was really frustrating for a while…