Can someone point out some testcase where my STAIRWAY code gives wrong output

my code for https://www.codechef.com/DI15R048/problems/STAIRWAY is failing to pass. can some one provide me the test cases where my code fails
http://ideone.com/Lpwu6I

i too want to know its correct solution…can sm1 plz point out mistake in the above code

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