Hi guy, I have been doing this problem : https://cses.fi/problemset/task/2073/

Given a string and m query which request reverse a substring. Print the final string

I solve it by Treap but I got Undefine Behavior (I run my code on my laptop and got correct answer, but on CSES is not). I was trying to fix it for six hour's but it's not better. Please tell me what was wrong in my code, thank you a ton!

Here is my code : https://cses.fi/paste/695ccf4c2fc0a9521c5235/

Update : I found some hint to continue debugging, i will comeback to fixed this blog if after I solve it