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替罪羊树
kd_tree
Codeforces Round #652 (Div. 2) prob:3/4/6 rk:1825/14647
prob:3/4/6
rk:1825/14647
Educational Codeforces Round 90 (Rated for Div. 2) prob:4/4/7 rk:3367/12840
prob:4/4/7
rk:3367/12840