Submission #1839643


Source Code Expand

#include<bits/stdc++.h>
#define N ((1<<17)+3)
using namespace std;
vector<int> son[N];
vector<pair<int,int> > dp[N];
int mid,dis[N];
vector<pair<int,int> > 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],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<int,int> 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%d",&fa[i],&dis[i]),son[fa[i]].push_back(i);
    int l=-1,r=2e9;//(]
    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 0
Code Size 1461 Byte
Status WA
Exec Time 465 ms
Memory 23544 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:38:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:39:79: 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%d",&fa[i],&dis[i]),son[fa[i]].push_back(i);
                                                                               ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 1400
Status
AC × 4
AC × 50
WA × 4
Set Name Test Cases
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 6 ms 6528 KB
002.txt AC 6 ms 6528 KB
003.txt AC 6 ms 6528 KB
004.txt AC 6 ms 6528 KB
005.txt AC 6 ms 6528 KB
006.txt AC 6 ms 6528 KB
007.txt AC 6 ms 6528 KB
008.txt AC 6 ms 6528 KB
009.txt AC 6 ms 6528 KB
010.txt AC 191 ms 13568 KB
011.txt AC 209 ms 13568 KB
012.txt AC 200 ms 13568 KB
013.txt AC 205 ms 13568 KB
014.txt AC 190 ms 13568 KB
015.txt AC 201 ms 13568 KB
016.txt AC 205 ms 13568 KB
017.txt AC 202 ms 13568 KB
018.txt AC 208 ms 13568 KB
019.txt AC 211 ms 13568 KB
020.txt AC 212 ms 13568 KB
021.txt AC 213 ms 13568 KB
022.txt AC 220 ms 13568 KB
023.txt AC 212 ms 13568 KB
024.txt AC 205 ms 13568 KB
025.txt AC 194 ms 13568 KB
026.txt AC 192 ms 13568 KB
027.txt AC 226 ms 13568 KB
028.txt AC 197 ms 13568 KB
029.txt AC 183 ms 13568 KB
030.txt AC 182 ms 13568 KB
031.txt AC 215 ms 13568 KB
032.txt AC 212 ms 13568 KB
033.txt AC 172 ms 13568 KB
034.txt AC 187 ms 13568 KB
035.txt AC 215 ms 13568 KB
036.txt AC 192 ms 13568 KB
037.txt AC 182 ms 13568 KB
038.txt AC 190 ms 13568 KB
039.txt AC 173 ms 13568 KB
040.txt AC 419 ms 23544 KB
041.txt AC 464 ms 23544 KB
042.txt AC 460 ms 23544 KB
043.txt AC 465 ms 23544 KB
044.txt AC 151 ms 22784 KB
045.txt WA 141 ms 18176 KB
046.txt WA 140 ms 19456 KB
047.txt WA 140 ms 18560 KB
048.txt WA 148 ms 21248 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