Format

• 90 minutes
• 4 programming problems

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1. K^th Character

Exactly same problem was posted in TJO previously with detailed solution!
Check the solution in this Arcesium TJO post.

2. XorSum

3. Co-prime Pairs

4. Optimise Code

My attempt to XORSUM problem: `https://codeforces.com/blog/entry/81136?#comment-822318` Please let me know whether it's correct or not. Thanks