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这个是考虑多分枝的,也是WAIn Reply To:data Posted by:jerryjiang at 2011-06-27 03:23:09 #include<stdio.h> #include<vector> using namespace std; #define N 100003 typedef struct Node { bool flag; int cnt,p; vector<int>child; }Node; Node Tree[N]; void inittree(int n) { for(int i=0;i<=n;i++) { Tree[i].flag=false; Tree[i].cnt=Tree[i].p=0; } } int buildtree(int i) { if(i==0) return 0; Tree[i].flag=true; Tree[i].cnt=1; for(int j=0;j<Tree[i].child.size();j++) { Tree[i].cnt+=buildtree(Tree[i].child[j]); } return Tree[i].cnt; } void updatetree(int i,int d) { while(i!=0) { Tree[i].cnt+=d; i=Tree[i].p; } } int main() { int n,i,u,v,tmp,m; char ch; //freopen("data.txt","r",stdin); scanf("%d",&n); inittree(n); for(i=1;i<n;i++) { scanf("%d%d",&u,&v); if(u>v) {tmp=u;u=v;v=tmp;} Tree[u].child.push_back(v); Tree[v].p=u; } buildtree(1); scanf("%d",&m); while(m--) { scanf(" %c%d",&ch,&i); if(ch=='C') { if(Tree[i].flag) { Tree[i].flag=false; updatetree(i,-1); } else { Tree[i].flag=true; updatetree(i,1); } } else if(ch=='Q') { printf("%d\n",Tree[i].cnt); } } return 0; } Followed by: Post your reply here: |
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