更正:线段树中t[rt]=val[l]改为val[dfp[l]].
by YXC_ZY_Forever @ 2023-02-19 20:10:56
但是没有改变.
by YXC_ZY_Forever @ 2023-02-19 20:11:24
第144行应该为update(dfn[x],dfn[x],a)
by 黄海辰 @ 2023-02-19 20:46:09