stay positive

y is dp so confusing

litty ppl: Blackgaurdian3 jdabtieu sortSlave yzhao123 azeng IR3KT4FUN

discord: KoreaFriedChips#0100

b41aa825be2e

to-do: https://dmoj.ca/problem/cco10p1 https://dmoj.ca/problem/acc1p2 https://dmoj.ca/problem/tree2 https://dmoj.ca/problem/ccc16s3 https://dmoj.ca/problem/ioi13p1io https://dmoj.ca/problem/ecoo20p4 https://dmoj.ca/problem/dmopc14c4p6

seg tree: https://dmoj.ca/problem/ds3 https://dmoj.ca/problem/ccc21s5 https://dmoj.ca/problem/2drmq