Didn't anyone else feel weak test case in "Make GCD" problem in the Asia-West Finals ICPC 2019?
After the contest, I realized my solution (that got my team AC in contest) will fail for some test cases.
The problem was -
"Create an array of <= 10^5 size with elements <=10^5, that has sum of GCD of all subarrays equal to X (1<=X<=10^13)".