Submission #1515935
Source Code Expand
#include <iostream> #include <vector> #include <queue> using namespace std; int n,a[100000],child[100000]; vector<int> G[100000]; bool flag = true; int dfs(int v,int par){ if(v && G[v].size() == 1) return a[v]; int sum = 0,ma = 0; for(int i = 0;i < G[v].size();i++){ int to = G[v][i]; if(par == to) continue; int ans = dfs(to,v); if(ans < 0) return -1; sum += ans; ma = max(ma,ans); } if(min(sum - ma,sum / 2) < sum - a[v] || a[v] * 2 - sum < 0) { flag = false; return -1; } return a[v] * 2 - sum; } int main(){ cin >> n; for(int i = 0;i < n;i++) cin >> a[i]; for(int i = 0;i < n - 1;i++){ int u,v; cin >> u >> v;u--;v--; G[u].push_back(v); G[v].push_back(u); } dfs(0,-1); if(flag) cout << "YES" << endl; else cout << "NO" << endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | hoget157 |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 825 Byte |
Status | WA |
Exec Time | 143 ms |
Memory | 12800 KB |
Judge Result
Set Name | Sample | All | ||||||
---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 700 | ||||||
Status |
|
|
Set Name | Test Cases |
---|---|
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 | 127 ms | 6272 KB |
in10.txt | AC | 125 ms | 6272 KB |
in11.txt | AC | 137 ms | 11520 KB |
in12.txt | AC | 143 ms | 11520 KB |
in13.txt | AC | 109 ms | 12800 KB |
in14.txt | AC | 109 ms | 11904 KB |
in15.txt | AC | 2 ms | 2560 KB |
in16.txt | AC | 2 ms | 2560 KB |
in17.txt | AC | 2 ms | 2560 KB |
in18.txt | AC | 2 ms | 2560 KB |
in19.txt | AC | 121 ms | 6272 KB |
in2.txt | AC | 125 ms | 6272 KB |
in20.txt | AC | 123 ms | 6272 KB |
in21.txt | AC | 125 ms | 6272 KB |
in22.txt | AC | 120 ms | 6272 KB |
in23.txt | AC | 125 ms | 6272 KB |
in24.txt | AC | 127 ms | 6272 KB |
in25.txt | AC | 2 ms | 2560 KB |
in26.txt | AC | 138 ms | 6272 KB |
in27.txt | AC | 136 ms | 6272 KB |
in28.txt | AC | 2 ms | 2560 KB |
in29.txt | AC | 104 ms | 6272 KB |
in3.txt | AC | 124 ms | 6272 KB |
in30.txt | WA | 2 ms | 2560 KB |
in31.txt | WA | 125 ms | 6272 KB |
in32.txt | WA | 122 ms | 6272 KB |
in33.txt | AC | 124 ms | 6272 KB |
in34.txt | AC | 122 ms | 6272 KB |
in35.txt | WA | 124 ms | 6272 KB |
in36.txt | WA | 123 ms | 6272 KB |
in37.txt | AC | 3 ms | 2688 KB |
in38.txt | AC | 123 ms | 6272 KB |
in39.txt | AC | 122 ms | 6272 KB |
in4.txt | AC | 124 ms | 6272 KB |
in40.txt | AC | 120 ms | 6272 KB |
in41.txt | AC | 123 ms | 6272 KB |
in42.txt | WA | 123 ms | 6272 KB |
in43.txt | AC | 124 ms | 6272 KB |
in44.txt | AC | 123 ms | 6272 KB |
in45.txt | WA | 124 ms | 6272 KB |
in5.txt | AC | 122 ms | 6272 KB |
in6.txt | AC | 124 ms | 6272 KB |
in7.txt | AC | 113 ms | 5888 KB |
in8.txt | AC | 30 ms | 3456 KB |
in9.txt | AC | 123 ms | 6272 KB |
sample1.txt | AC | 2 ms | 2560 KB |
sample2.txt | AC | 2 ms | 2560 KB |
sample3.txt | AC | 2 ms | 2560 KB |