We can change stack size in linux temporarily by using the command ulimit -s new_value, But is there any way to change stack size permanently, or Can we do something within C++ code, so it will change stack size by itself?

I tried changing this, but It didn't work. I faced this issue in hackercup qualification round D2, terminal gave segfault, and later I came to know about the low value of default stack size in linux.

Can any one help me with why this solution is getting TLE, are the constants too high? My solution is here in which I made single segment tree for whole of the tree And the one which got AC, in which I made different segtree for each heavy path, is here

Edit :- Got it now, Thanks to jef