Submission #1693705
Source Code Expand
#include<bits/stdc++.h> using namespace std; typedef long long ll; vector<int> v[100000]; ll n,a[100000]; ll c[100000]; bool ans=1; ll dfs(int p,int pr){ if(v[p].size()==1&&pr!=-1)return a[p]; vector<ll> vv; for(int i=0;i<v[p].size();i++){ int np=v[p][i]; if(np!=pr)vv.push_back(dfs(np,p)); } ll s=0,mx=0; for(int i=0;i<vv.size();i++)s+=vv[i],mx=max(mx,vv[i]); ll x=s-a[p]; ll m; if(s>=mx*2)m=s/2; else m=s-mx; if(x>m)ans=0; if(pr==-1){ if(s!=a[p])ans=0; } return s-2*x; } int main(){ cin>>n; for(int i=0;i<n;i++)cin>>a[i]; for(int i=0,a,b;i<n-1;i++){ cin>>a>>b; a--,b--; v[a].push_back(b); v[b].push_back(a); } int m=0; for(int i=0;i<n;i++) if(v[i].size()==1)m=i; dfs(m,-1); cout<<(ans?"YES":"NO")<<endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | kawabys |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 868 Byte |
Status | WA |
Exec Time | 136 ms |
Memory | 17408 KB |
Judge Result
Set Name | Sample | All | ||||||
---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 700 | ||||||
Status |
|
|
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 | AC | 116 ms | 6656 KB |
in10.txt | AC | 124 ms | 6656 KB |
in11.txt | AC | 136 ms | 17408 KB |
in12.txt | AC | 136 ms | 17408 KB |
in13.txt | AC | 112 ms | 17408 KB |
in14.txt | AC | 114 ms | 17408 KB |
in15.txt | AC | 3 ms | 2560 KB |
in16.txt | AC | 3 ms | 2560 KB |
in17.txt | AC | 3 ms | 2560 KB |
in18.txt | AC | 3 ms | 2560 KB |
in19.txt | AC | 124 ms | 6656 KB |
in2.txt | AC | 120 ms | 6656 KB |
in20.txt | AC | 123 ms | 6656 KB |
in21.txt | AC | 124 ms | 6656 KB |
in22.txt | AC | 119 ms | 6656 KB |
in23.txt | WA | 119 ms | 6656 KB |
in24.txt | AC | 119 ms | 6656 KB |
in25.txt | AC | 3 ms | 2560 KB |
in26.txt | AC | 128 ms | 6656 KB |
in27.txt | AC | 131 ms | 6656 KB |
in28.txt | AC | 3 ms | 2560 KB |
in29.txt | AC | 109 ms | 6656 KB |
in3.txt | AC | 122 ms | 6656 KB |
in30.txt | WA | 3 ms | 2560 KB |
in31.txt | AC | 119 ms | 6656 KB |
in32.txt | AC | 118 ms | 6656 KB |
in33.txt | AC | 118 ms | 6656 KB |
in34.txt | AC | 120 ms | 6656 KB |
in35.txt | AC | 124 ms | 6656 KB |
in36.txt | AC | 117 ms | 6656 KB |
in37.txt | AC | 4 ms | 2688 KB |
in38.txt | AC | 128 ms | 6656 KB |
in39.txt | AC | 122 ms | 6656 KB |
in4.txt | AC | 125 ms | 6656 KB |
in40.txt | AC | 121 ms | 6656 KB |
in41.txt | AC | 125 ms | 6656 KB |
in42.txt | AC | 124 ms | 6656 KB |
in43.txt | AC | 121 ms | 6656 KB |
in44.txt | WA | 128 ms | 6656 KB |
in45.txt | AC | 116 ms | 6656 KB |
in5.txt | AC | 117 ms | 6656 KB |
in6.txt | AC | 118 ms | 6656 KB |
in7.txt | AC | 106 ms | 6144 KB |
in8.txt | AC | 27 ms | 3584 KB |
in9.txt | AC | 124 ms | 6656 KB |
sample1.txt | AC | 3 ms | 2560 KB |
sample2.txt | AC | 3 ms | 2560 KB |
sample3.txt | AC | 3 ms | 2560 KB |