Square Brackets--where am i going wrong?

#1

Link–https://ide.codingblocks.com/s/164542
why is my code giving wa .I unlocked the test cases and saw that it is generating 0 for some cases,it is getting overflowed i think or there is some issue.Pls reply asap.I am stuck on it.

#2

Take mod like this.
ans = (ans%mod + x%mod)%mod to avoid overflow.

#3

still giving WA.Link—https://ide.codingblocks.com/s/164761

#4

Code is alright. I am also getting WA for this question. Maybe string multiplication has to be used. You can skip the question from here and move onto other.

#5

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