Submission #1612857
Source Code Expand
#include<bits/stdc++.h> #define N 100005 #define LL long long using namespace std; vector<int> G[N]; int n,a[N],d[N],rt; void GG(){ printf("NO"); exit(0);} void dfs(int t,int fa) { int i; LL Max=0,x,sum=0; if(d[t]==1) return ; for(i=0;i<G[t].size();i++) if(G[t][i]!=fa) dfs(G[t][i],t); for(i=0;i<G[t].size();i++) if(G[t][i]!=fa) sum+=a[G[t][i]],Max=max(Max,1LL*a[G[t][i]]); x=sum-a[t]; if(x<0||2*x>sum) GG(); if(Max*2>sum&&x>sum-Max) GG(); a[t]=sum-2*x; } int main() { int i,x,y; scanf("%d",&n); for(i=1;i<=n;i++) scanf("%d",&a[i]); for(i=1;i<n;i++){ scanf("%d %d",&x,&y); G[x].push_back(y),d[x]++; G[y].push_back(x),d[y]++; } for(i=1;i<=n;i++) if(d[i]!=1) rt=i; dfs(rt,0); if(a[rt]!=0) GG(); printf("YES"); return 0; }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | MemorySlices |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 793 Byte |
Status | WA |
Exec Time | 59 ms |
Memory | 13568 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:25:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ ./Main.cpp:26:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) scanf("%d",&a[i]); ^ ./Main.cpp:28:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^
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 | 50 ms | 6656 KB |
in10.txt | AC | 50 ms | 6656 KB |
in11.txt | AC | 59 ms | 12416 KB |
in12.txt | AC | 58 ms | 11776 KB |
in13.txt | AC | 48 ms | 12800 KB |
in14.txt | AC | 48 ms | 13568 KB |
in15.txt | AC | 2 ms | 2560 KB |
in16.txt | AC | 2 ms | 2560 KB |
in17.txt | AC | 2 ms | 2560 KB |
in18.txt | WA | 2 ms | 2560 KB |
in19.txt | AC | 46 ms | 6656 KB |
in2.txt | AC | 48 ms | 6656 KB |
in20.txt | AC | 45 ms | 6656 KB |
in21.txt | AC | 45 ms | 6656 KB |
in22.txt | AC | 46 ms | 6656 KB |
in23.txt | AC | 47 ms | 6656 KB |
in24.txt | AC | 46 ms | 6656 KB |
in25.txt | AC | 2 ms | 2560 KB |
in26.txt | AC | 46 ms | 6656 KB |
in27.txt | AC | 51 ms | 6656 KB |
in28.txt | AC | 9 ms | 2560 KB |
in29.txt | AC | 44 ms | 6656 KB |
in3.txt | AC | 51 ms | 6656 KB |
in30.txt | AC | 2 ms | 2560 KB |
in31.txt | AC | 47 ms | 6656 KB |
in32.txt | AC | 49 ms | 6656 KB |
in33.txt | AC | 53 ms | 6656 KB |
in34.txt | AC | 49 ms | 6656 KB |
in35.txt | AC | 52 ms | 6656 KB |
in36.txt | AC | 54 ms | 6656 KB |
in37.txt | AC | 3 ms | 2688 KB |
in38.txt | AC | 55 ms | 6656 KB |
in39.txt | AC | 50 ms | 6656 KB |
in4.txt | AC | 48 ms | 6656 KB |
in40.txt | AC | 50 ms | 6656 KB |
in41.txt | AC | 54 ms | 6656 KB |
in42.txt | AC | 48 ms | 6656 KB |
in43.txt | AC | 47 ms | 6656 KB |
in44.txt | AC | 49 ms | 6656 KB |
in45.txt | AC | 53 ms | 6656 KB |
in5.txt | AC | 48 ms | 6656 KB |
in6.txt | AC | 53 ms | 6656 KB |
in7.txt | AC | 45 ms | 6144 KB |
in8.txt | AC | 13 ms | 3584 KB |
in9.txt | AC | 49 ms | 6656 KB |
sample1.txt | AC | 2 ms | 2560 KB |
sample2.txt | AC | 2 ms | 2560 KB |
sample3.txt | AC | 2 ms | 2560 KB |