Is test case #0 for this problem the same as sample test case? If no, is the sample test case even included in the test cases?
It is Contest time buddy!
If you have any query ask in the comment section below (Follows the guidelines there). If there is ant problem in the test cases it will be rectified. (as it has been done for SMPLSUM once for subtask 2 where n>10^4 as pointed by me earlier). Do not discuss ideas or start new question related to questions from the contest. If you are getting wrong answer there must be some glitch in your algorithm.
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My answer matches with the sample, but not even 1 test case passes.
Earlier I made a submission which passed the first subtask
Hmm. I got the glitch anyways 
my algorithm can solve n= 10^29 in less than 200ms still i got TLE ont ther 3rd Subtask…idont know why??
yes!!!it will even work 10^86 if i want
i have tested this testcase
1
99999237367327365892087654253678976543123456789376534
output
5848430516900842602229212474367045204240696106127229704251133924571894931760743754356153803419271407030141
403milliseconds