http://acmicpc-pacnw.org/results.htm
https://codeforces.com/blog/entry/63070
https://codeforces.com/gym/101982
2018-2019-acmicpc-pacific-northwest-regional-contest
题目20182019-acmicpc-pacific-northwest-regional-contest-div-1-en.pdf
https://vjudge.net/contest/313001#problem/A 密码:zhanjinduoyin
官方题解PacNW2018_sols_and_io.zip
