记录编号 |
279720 |
评测结果 |
AAAAA |
题目名称 |
[UVa 548] 树 |
最终得分 |
100 |
用户昵称 |
@@@ |
是否通过 |
通过 |
代码语言 |
C++ |
运行时间 |
0.001 s |
提交时间 |
2016-07-09 16:13:49 |
内存使用 |
0.46 MiB |
显示代码纯文本
- #include<iostream>
- #include<cstdio>
- #include<string>
- #include<sstream>
- #include<algorithm>
- using namespace std;
- const int maxv=10000+10;
- int in_order[maxv],post_order[maxv],lch[maxv],rch[maxv];
- int n;
- bool read_list(int* a){
- string line;
- if(!getline(cin,line)) return false;
- stringstream ss(line);
- n=0;
- int x;
- while(ss>>x) a[n++]=x;
- return n>0;
- }
- int build(int L1,int R1,int L2,int R2){
- if(L1>R1) return 0;
- int root=post_order[R2];
- int p=L1;
- while(in_order[p]!=root) p++;
- int cnt=p-L1;
- lch[root]=build(L1,p-1,L2,L2+cnt-1);
- rch[root]=build(p+1,R1,L2+cnt,R2-1);
- return root;
- }
- int best,best_sum;
- void dfs(int u,int sum){
- sum+=u;
- if(!lch[u] && !rch[u]){
- if(sum<best_sum||(sum==best_sum&&u<best)){
- best=u;best_sum=sum;
- }
- }
- if(lch[u]) dfs(lch[u],sum);
- if(rch[u]) dfs(rch[u],sum);
- }
- int main(){
- freopen("sumtree.in", "r", stdin);
- freopen("sumtree.out", "w", stdout);
- while(read_list(in_order)){
- read_list(post_order);
- build(0,n-1,0,n-1);
- best_sum=1000000000;
- dfs(post_order[n-1],0);
- cout<<best<<"\n";
- }
- return 0;
- }