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While solving 1612C - Chat Ban I found something weird. I have submitted same code with C++14 and C++17,C++20. But it only was accepted with C++17.
C++14 :158761775
C++17 :158762654
C++20 :158762172
I tried to look for the reason online but could not find any.
contact your local exorcist asap
https://mirror.codeforces.com/contest/1612/submission/158779409
compare your solution with this modified solution of yours you will get it
or simply k*(k+1)/2 is not equal to (k*(k+1))/2
so in your code k*(k+1)/2 will give correct result if $$$k$$$ is $$$odd$$$ else it will give one less value then expected
i tried this code in custom test and it gives the correct result even if k is even.
I don`t think it`s the reason because the order of operator is defined in the standard of c++.
i think it is because of precision issues, i fixed it by adding (long double) inside the sqrt function: 158781091
yaa you are right