Submission #1305993
Source Code Expand
#include<bits/stdc++.h> using namespace std; typedef long long ll; int N; vector<ll> A; vector<vector<int> > adj; vector<ll> up; bool dfs(int u, int p) { if(adj[u].size() == 1) { up[u] = A[u]; return true; } ll sum = 0; for(int i = 0; i < adj[u].size(); i++) { int v = adj[u][i]; if(v == p) continue; if(!dfs(v, u)) return false; sum += up[v]; } if(sum < A[u]) return false; if(2*A[u] - sum < 0) return false; up[u] = 2*A[u] - sum; for(int i = 0; i < adj[u].size(); i++) { int v = adj[u][i]; if(v == p) continue; if(2*up[v] > sum) { ll mm = sum - up[v]; if(sum - A[u] <= mm) return true; else return false; } } ll mm = sum / 2; if(sum - A[u] <= mm) return true; } int main() { scanf("%d", &N); A.resize(N); for(int i = 0; i < N; i++) { scanf("%lld", &A[i]); } adj.resize(N); for(int i = 0; i < N - 1; i++) { int u, v; scanf("%d %d", &u, &v); u--; v--; adj[u].push_back(v); adj[v].push_back(u); } if(N == 2) { if(A[0] == A[1]) printf("YES"); else printf("NO"); return 0; } up.resize(N); for(int i = 0; i < N; i++) if(adj[i].size() != 1) { if(dfs(i, -1) && !up[i]) printf("YES"); else printf("NO"); return 0; } }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | choikiwon |
Language | C++14 (GCC 5.4.1) |
Score | 700 |
Code Size | 1474 Byte |
Status | AC |
Exec Time | 50 ms |
Memory | 13952 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:38:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ ./Main.cpp:41:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &A[i]); ^ ./Main.cpp:45:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int u, v; scanf("%d %d", &u, &v); ^
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 700 / 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 | AC | 48 ms | 7424 KB |
in10.txt | AC | 48 ms | 7424 KB |
in11.txt | AC | 48 ms | 12672 KB |
in12.txt | AC | 50 ms | 12672 KB |
in13.txt | AC | 47 ms | 13952 KB |
in14.txt | AC | 46 ms | 13056 KB |
in15.txt | AC | 1 ms | 256 KB |
in16.txt | AC | 1 ms | 256 KB |
in17.txt | AC | 1 ms | 256 KB |
in18.txt | AC | 1 ms | 256 KB |
in19.txt | AC | 46 ms | 7424 KB |
in2.txt | AC | 49 ms | 7424 KB |
in20.txt | AC | 42 ms | 7424 KB |
in21.txt | AC | 44 ms | 7424 KB |
in22.txt | AC | 47 ms | 7424 KB |
in23.txt | AC | 44 ms | 7424 KB |
in24.txt | AC | 45 ms | 7424 KB |
in25.txt | AC | 1 ms | 256 KB |
in26.txt | AC | 45 ms | 7424 KB |
in27.txt | AC | 44 ms | 7424 KB |
in28.txt | AC | 1 ms | 256 KB |
in29.txt | AC | 42 ms | 7424 KB |
in3.txt | AC | 46 ms | 7424 KB |
in30.txt | AC | 1 ms | 256 KB |
in31.txt | AC | 47 ms | 7424 KB |
in32.txt | AC | 45 ms | 7424 KB |
in33.txt | AC | 48 ms | 7424 KB |
in34.txt | AC | 48 ms | 7424 KB |
in35.txt | AC | 48 ms | 7424 KB |
in36.txt | AC | 48 ms | 7424 KB |
in37.txt | AC | 2 ms | 256 KB |
in38.txt | AC | 47 ms | 7424 KB |
in39.txt | AC | 47 ms | 7424 KB |
in4.txt | AC | 48 ms | 7424 KB |
in40.txt | AC | 44 ms | 7424 KB |
in41.txt | AC | 45 ms | 7424 KB |
in42.txt | AC | 48 ms | 7424 KB |
in43.txt | AC | 46 ms | 7424 KB |
in44.txt | AC | 48 ms | 7424 KB |
in45.txt | AC | 48 ms | 7424 KB |
in5.txt | AC | 49 ms | 7424 KB |
in6.txt | AC | 48 ms | 7424 KB |
in7.txt | AC | 43 ms | 6656 KB |
in8.txt | AC | 12 ms | 1920 KB |
in9.txt | AC | 48 ms | 7424 KB |
sample1.txt | AC | 1 ms | 256 KB |
sample2.txt | AC | 1 ms | 256 KB |
sample3.txt | AC | 1 ms | 256 KB |