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Time Limit: 8000/4000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 967 Accepted Submission(s): 308
#include<bits/stdc++.h> using namespace std; const int maxn=1e5+200; int n,tot; struct Edge{ int to,w,next; Edge(){} Edge(int too,int ww,int nextt){ to=too;w=ww;next=nextt; } }edges[maxn*3]; typedef long long INT; int head[maxn*2],val[maxn*2]; int times[maxn*2]; void init(){ tot=0; memset(head,-1,sizeof(head)); memset(times,0,sizeof(times)); memset(val,0,sizeof(val)); } void addedge(int fro , int to,int wei){ edges[tot]=Edge(to,wei,head[fro]); head[fro]=tot++; edges[tot]=Edge(fro,wei,head[to]); head[to]=tot++; } void dfs(int u,int fa){ times[val[u]]++; for(int i=head[u];i!=-1;i=edges[i].next){ Edge &e=edges[i]; if(e.to==fa) continue; val[e.to]=val[u]^e.w; dfs(e.to,u); } return ; } int main(){ // freopen("1011.in","r",stdin); // freopen("why.txt","w",stdout); int t , m, a,b,c ,s; scanf("%d",&t); while(t--){ init(); scanf("%d",&n); for(int i=1;i<n;i++){ scanf("%d%d%d",&a,&b,&c); addedge(a,b,c); } dfs(1,-1); scanf("%d",&m); while(m--){ INT ans=0; scanf("%d",&s); for(int i=1;i<=n;++i){ if(times[val[i]^s]){ ans+=times[val[i]^s]; } } if(s==0) ans+=n; printf("%lld\n",ans/2); } } return 0; }
HDU 5416——CRB and Tree——————【DFS搜树】
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原文地址:http://www.cnblogs.com/chengsheng/p/4756870.html