Submission #1093575
Source Code Expand
#include<bits/stdc++.h> using namespace std; typedef long long ll; ll n, rt, a[100005], up[100005]; vector<ll> adj[100005]; priority_queue<pair<ll,ll> > pq[100005]; void solve (ll cur, ll prv) { if(adj[cur].size() == 1) { up[cur] = a[cur]; return; } ll sum = 0, mx = 0; for(auto &nxt : adj[cur]) { if(nxt == prv) continue; solve(nxt, cur); sum += up[nxt]; mx = max(up[nxt], mx); } if(sum - (mx * 2 > sum ? sum - mx : sum / 2) > a[cur]) { puts("NO"); exit(0); } up[cur] = sum - 2*(sum - a[cur]); } int main() { scanf("%lld",&n); for(int i=1;i<=n;i++) scanf("%lld",&a[i]); for(int i=1;i<n;i++) { ll A, B; scanf("%lld%lld",&A,&B); adj[A].push_back(B); adj[B].push_back(A); } if(n == 2) { puts(a[1] == a[2] ? "YES" : "NO"); return 0; } for(int i=1;i<=n;i++) { if(adj[i].size() > 1) { rt = i; break; } } solve(rt, 0); puts(up[rt] ? "NO" : "YES"); }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | khsoo01 |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 946 Byte |
Status | WA |
Exec Time | 60 ms |
Memory | 15744 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:29:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^ ./Main.cpp:30:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%lld",&a[i]); ^ ./Main.cpp:33:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&A,&B); ^
Judge Result
Set Name | Sample | All | ||||||
---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 700 | ||||||
Status |
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|
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 |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
in1.txt | AC | 55 ms | 11008 KB |
in10.txt | AC | 55 ms | 11008 KB |
in11.txt | AC | 60 ms | 14720 KB |
in12.txt | AC | 60 ms | 14720 KB |
in13.txt | AC | 56 ms | 15744 KB |
in14.txt | AC | 56 ms | 14976 KB |
in15.txt | AC | 8 ms | 5760 KB |
in16.txt | AC | 8 ms | 5760 KB |
in17.txt | AC | 8 ms | 5760 KB |
in18.txt | AC | 8 ms | 5760 KB |
in19.txt | AC | 54 ms | 11008 KB |
in2.txt | AC | 55 ms | 11008 KB |
in20.txt | AC | 52 ms | 10240 KB |
in21.txt | AC | 52 ms | 10240 KB |
in22.txt | AC | 55 ms | 11008 KB |
in23.txt | WA | 55 ms | 11008 KB |
in24.txt | AC | 56 ms | 11008 KB |
in25.txt | AC | 8 ms | 5760 KB |
in26.txt | AC | 53 ms | 10240 KB |
in27.txt | AC | 53 ms | 10240 KB |
in28.txt | AC | 8 ms | 5760 KB |
in29.txt | AC | 49 ms | 10240 KB |
in3.txt | AC | 56 ms | 11008 KB |
in30.txt | WA | 8 ms | 5760 KB |
in31.txt | WA | 58 ms | 11008 KB |
in32.txt | WA | 58 ms | 11008 KB |
in33.txt | AC | 55 ms | 11008 KB |
in34.txt | AC | 55 ms | 11008 KB |
in35.txt | AC | 55 ms | 11008 KB |
in36.txt | AC | 56 ms | 11008 KB |
in37.txt | AC | 8 ms | 5760 KB |
in38.txt | AC | 54 ms | 11008 KB |
in39.txt | AC | 55 ms | 11008 KB |
in4.txt | AC | 56 ms | 11008 KB |
in40.txt | AC | 53 ms | 11008 KB |
in41.txt | AC | 53 ms | 11008 KB |
in42.txt | AC | 55 ms | 11008 KB |
in43.txt | AC | 55 ms | 11008 KB |
in44.txt | AC | 56 ms | 11008 KB |
in45.txt | AC | 56 ms | 11008 KB |
in5.txt | AC | 56 ms | 11008 KB |
in6.txt | AC | 56 ms | 11008 KB |
in7.txt | AC | 50 ms | 10496 KB |
in8.txt | AC | 19 ms | 6912 KB |
in9.txt | AC | 56 ms | 11008 KB |
sample1.txt | AC | 8 ms | 5760 KB |
sample2.txt | AC | 8 ms | 5760 KB |
sample3.txt | AC | 8 ms | 5760 KB |