Submission #1480614
Source Code Expand
#include "bits/stdc++.h" using namespace std; typedef long long ll; typedef pair<int,int> pii; #define rep(i,n) for(ll i=0;i<(ll)(n);i++) #define all(a) (a).begin(),(a).end() #define pb emplace_back #define INF (1e9+1) vector<int> G[100000]; vector<int> a(100000); vector<int> deg; int dfs(int cur, int prev){ if(deg[cur]==1)return a[cur]; ll sigma = 0; int maxC = 0; for(auto e:G[cur]){ if(e==prev)continue; int res = dfs(e,cur); maxC = max(maxC,res); sigma+=res; } int t = 2*a[cur] - sigma; if( t<0 || t>a[cur] || sigma%2==1 || sigma-t > 2*min(sigma-maxC,sigma/2) )throw -1; return t; } int main(){ int n; cin>>n; rep(i,n)cin>>a[i]; deg.resize(n,0); rep(i,n-1){ int s,t; cin>>s>>t; s--,t--; deg[s]++; deg[t]++; G[s].pb(t); G[t].pb(s); } int root = 0; while(deg[root]==1)root++; int res; try{ res = dfs(root,-1); }catch(int e){ cout<<"NO"<<endl; return 0; } if(res==0){ cout<<"YES"<<endl; }else{ cout<<"NO"<<endl; } }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | Yazaten |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 1227 Byte |
Status | WA |
Exec Time | 132 ms |
Memory | 13184 KB |
Judge Result
Set Name | Sample | All | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 700 | ||||||||
Status |
|
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Set Name | Test Cases |
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Sample | sample1.txt, sample2.txt, sample3.txt |
All | sample1.txt, sample2.txt, sample3.txt, in1.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in2.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in3.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in4.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in5.txt, in6.txt, in7.txt, in8.txt, in9.txt, sample1.txt, sample2.txt, sample3.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
in1.txt | WA | 101 ms | 6656 KB |
in10.txt | WA | 100 ms | 6656 KB |
in11.txt | AC | 114 ms | 11904 KB |
in12.txt | WA | 132 ms | 8832 KB |
in13.txt | AC | 93 ms | 13184 KB |
in14.txt | AC | 92 ms | 12288 KB |
in15.txt | AC | 2 ms | 2944 KB |
in16.txt | AC | 2 ms | 2944 KB |
in17.txt | AC | 2 ms | 2944 KB |
in18.txt | WA | 2 ms | 2944 KB |
in19.txt | AC | 100 ms | 6656 KB |
in2.txt | WA | 99 ms | 6656 KB |
in20.txt | AC | 102 ms | 6656 KB |
in21.txt | AC | 104 ms | 6656 KB |
in22.txt | AC | 100 ms | 6656 KB |
in23.txt | AC | 101 ms | 6656 KB |
in24.txt | AC | 101 ms | 6656 KB |
in25.txt | AC | 3 ms | 2944 KB |
in26.txt | AC | 112 ms | 6656 KB |
in27.txt | AC | 112 ms | 6656 KB |
in28.txt | AC | 2 ms | 2944 KB |
in29.txt | AC | 88 ms | 6656 KB |
in3.txt | WA | 99 ms | 6656 KB |
in30.txt | AC | 2 ms | 2944 KB |
in31.txt | AC | 99 ms | 6656 KB |
in32.txt | AC | 103 ms | 6656 KB |
in33.txt | WA | 99 ms | 6656 KB |
in34.txt | WA | 100 ms | 6656 KB |
in35.txt | AC | 100 ms | 6656 KB |
in36.txt | AC | 102 ms | 6656 KB |
in37.txt | AC | 3 ms | 3072 KB |
in38.txt | AC | 99 ms | 6656 KB |
in39.txt | AC | 100 ms | 6656 KB |
in4.txt | WA | 100 ms | 6656 KB |
in40.txt | AC | 99 ms | 6656 KB |
in41.txt | AC | 99 ms | 6656 KB |
in42.txt | AC | 100 ms | 6656 KB |
in43.txt | AC | 100 ms | 6656 KB |
in44.txt | AC | 100 ms | 6656 KB |
in45.txt | AC | 99 ms | 6656 KB |
in5.txt | WA | 99 ms | 6656 KB |
in6.txt | WA | 99 ms | 6656 KB |
in7.txt | WA | 90 ms | 6272 KB |
in8.txt | WA | 25 ms | 3840 KB |
in9.txt | WA | 100 ms | 6656 KB |
sample1.txt | WA | 2 ms | 2944 KB |
sample2.txt | AC | 2 ms | 2944 KB |
sample3.txt | AC | 2 ms | 2944 KB |