##基本
abs
sin/cos/tan
string
##初心者(100~300)
[min/max]
(https://qiita.com/sibata_yuna/items/8cdb93a062bcee84bfda)
swap
__gcd
rand
clock
reverse
sort
##中級者(200~400)
vector
stack
queue
priority_queue
[map]
(https://qiita.com/sibata_yuna/items/d69ad0977caca218ff42)
lower_bound
set
pair
tuple
##上級者
assert
count
find
next_permutation
__builtin_popcount
bitset