Submission #1839736
Source Code Expand
#include<bits/stdc++.h> #define N ((1<<17)+3) #define LL long long using namespace std; vector<int> son[N]; vector<pair<LL,LL> > dp[N]; LL mid,dis[N]; vector<pair<LL,LL> > temp; bool DFS(int u,int fr){ dp[u].clear(); for(int i:son[u]) if(!DFS(i,u)) return false; if(son[u].size()==0){ dp[u].push_back(make_pair(0,0)); }else{ temp.clear(); int l=son[u][0],r=son[u][1];LL limit=mid-dis[l]-dis[r]; if(dp[l].size()>dp[r].size()) swap(l,r); for(int i=0,p=0;i<dp[l].size()&&p<dp[r].size();i++){ while(p+1<dp[r].size() && dp[l][i].second+dp[r][p+1].first <= limit) p++; if(dp[l][i].second+dp[r][p].first <= limit) temp.push_back(make_pair( dp[l][i].first+dis[l],dp[r][p].second+dis[r] )); } for(int i=temp.size()-1;i>=0;i--) temp.push_back(make_pair(temp[i].second,temp[i].first)); sort(temp.begin(),temp.end()); for(pair<LL,LL> x:temp){ if(dp[u].size()==0|| x.second < dp[u][dp[u].size()-1].second ) dp[u].push_back(x); } } return dp[u].size()!=0; } int n,fa[N]; int main(){ scanf("%d",&n); for(int i=2;i<=n;i++) scanf("%d%lld",&fa[i],&dis[i]),son[fa[i]].push_back(i); LL l=-1,r=1e12;//(] while(l+1<r){ mid=(l+r)>>1; if(!DFS(1,0)) l=mid; else r=mid; } cout<<r<<endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | E - Shik and Travel |
User | Wuvin |
Language | C++14 (GCC 5.4.1) |
Score | 1400 |
Code Size | 1481 Byte |
Status | AC |
Exec Time | 531 ms |
Memory | 33652 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:39:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ ./Main.cpp:40:81: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=2;i<=n;i++) scanf("%d%lld",&fa[i],&dis[i]),son[fa[i]].push_back(i); ^
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1400 / 1400 | ||||
Status |
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Set Name | Test Cases |
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Sample | example0.txt, example1.txt, example2.txt, example3.txt |
All | 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, 044.txt, 045.txt, 046.txt, 047.txt, 048.txt, 049.txt, example0.txt, example1.txt, example2.txt, example3.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
000.txt | AC | 6 ms | 6528 KB |
001.txt | AC | 7 ms | 6528 KB |
002.txt | AC | 7 ms | 6528 KB |
003.txt | AC | 6 ms | 6528 KB |
004.txt | AC | 7 ms | 6528 KB |
005.txt | AC | 7 ms | 6528 KB |
006.txt | AC | 6 ms | 6528 KB |
007.txt | AC | 7 ms | 6528 KB |
008.txt | AC | 7 ms | 6528 KB |
009.txt | AC | 6 ms | 6528 KB |
010.txt | AC | 256 ms | 15104 KB |
011.txt | AC | 292 ms | 15104 KB |
012.txt | AC | 247 ms | 15104 KB |
013.txt | AC | 268 ms | 15104 KB |
014.txt | AC | 251 ms | 15104 KB |
015.txt | AC | 258 ms | 15104 KB |
016.txt | AC | 281 ms | 15104 KB |
017.txt | AC | 262 ms | 15104 KB |
018.txt | AC | 262 ms | 15104 KB |
019.txt | AC | 249 ms | 14976 KB |
020.txt | AC | 281 ms | 15104 KB |
021.txt | AC | 272 ms | 15104 KB |
022.txt | AC | 258 ms | 15104 KB |
023.txt | AC | 275 ms | 15104 KB |
024.txt | AC | 271 ms | 15104 KB |
025.txt | AC | 239 ms | 15104 KB |
026.txt | AC | 238 ms | 14592 KB |
027.txt | AC | 255 ms | 15104 KB |
028.txt | AC | 238 ms | 14592 KB |
029.txt | AC | 231 ms | 14592 KB |
030.txt | AC | 208 ms | 15104 KB |
031.txt | AC | 328 ms | 15104 KB |
032.txt | AC | 260 ms | 15104 KB |
033.txt | AC | 195 ms | 15104 KB |
034.txt | AC | 212 ms | 15104 KB |
035.txt | AC | 272 ms | 15104 KB |
036.txt | AC | 218 ms | 15104 KB |
037.txt | AC | 207 ms | 14976 KB |
038.txt | AC | 216 ms | 15104 KB |
039.txt | AC | 201 ms | 14080 KB |
040.txt | AC | 449 ms | 33652 KB |
041.txt | AC | 511 ms | 33396 KB |
042.txt | AC | 517 ms | 33396 KB |
043.txt | AC | 531 ms | 33396 KB |
044.txt | AC | 187 ms | 24320 KB |
045.txt | AC | 201 ms | 19712 KB |
046.txt | AC | 208 ms | 20992 KB |
047.txt | AC | 204 ms | 20096 KB |
048.txt | AC | 208 ms | 22784 KB |
049.txt | AC | 3 ms | 6400 KB |
example0.txt | AC | 3 ms | 6400 KB |
example1.txt | AC | 3 ms | 6400 KB |
example2.txt | AC | 3 ms | 6400 KB |
example3.txt | AC | 3 ms | 6400 KB |