spawning observation information is entered in three primary tables (Fig.2). The first (“tblSitesForSpawningObservations”) is used to enter geographic information on each study site; the second (“tblSpawningObervations”) contains details of the spawning...
任取一个作为根节点,做两次dfs 考虑使用贡献来更新答案 而第二次dfs考虑这条边权的影响 #include<bits/stdc++.h> using namespace std; typedef long long ll; const int N=2e5+10; const int mod=11092019; ll t[N]; int n,m; ll ans[N]; ll v[N],depth[N]; ll f1[N],f2[N]; int h[...