URI Online Judge => https://www.urionlinejudge.com.br/judge/en
Profile -> click Here
Tree Mapping -> click Here
COJ => http://coj.uci.cu/index.xhtml
Tree Mapping -> click Here
AIZU Online Judge => http://judge.u-aizu.ac.jp/onlinejudge/
Profile -> click Here
Tree Mapping -> click Here
ZOJ => http://acm.zju.edu.cn/onlinejudge/
Tree Mapping -> click Here