Submission #3216748
Source Code Expand
#include"bits/stdc++.h"
using namespace std;
typedef long long LL;
const int N=132005;
struct pr{
LL in,out;
pr(LL _i=0,LL _o=0){in=_i,out=_o;}
};
vector<pr>dp[N],temp1,temp2;
vector<int>e[N];
int n,fa[N],dis[N],son[N][2],d[N];
LL deep[N],lim;
void insert(vector<pr>&v,const pr&i){
int p=v.size()-1;
if(!~p)v.push_back(i);
else if(i.out<v[p].out)v.push_back(i);
}
void vector_merge(vector<pr>&v,vector<pr>&l,vector<pr>&r){
v.clear();
int x=l.size(),y=r.size(),p=0,q=0;
if(!y)return;
while(p!=x){
while(q!=y&&l[p].out+r[q].in<=lim)q++;
if(q)q--;
if(l[p].out+r[q].in<=lim)v.push_back(pr(l[p].in,r[q].out));
p++;
}
}
void merge_sort(vector<pr>&v,vector<pr>&l,vector<pr>&r){
v.clear();
int x=l.size(),y=r.size(),p=0,q=0;
while(p!=x||q!=y){
if(p==x)insert(v,r[q++]);
else if(q==y)insert(v,l[p++]);
else if(l[p].in<r[q].in)insert(v,l[p++]);
else insert(v,r[q++]);
}
}
void dfs(int x){
if(!d[x]){
dp[x].clear();
dp[x].push_back(pr(deep[x],deep[x]));
return;
}
int ls=son[x][0],rs=son[x][1];
dfs(ls),dfs(rs);
lim+=2*deep[x];
vector_merge(temp1,dp[ls],dp[rs]);
vector_merge(temp2,dp[rs],dp[ls]);
merge_sort(dp[x],temp1,temp2);
lim-=2*deep[x];
}
int main(){
#ifdef whzzt
freopen("travel.in","r",stdin);
freopen("travel.out","w",stdout);
#endif
scanf("%d",&n);
for(int i=2;i<=n;i++){
scanf("%d%d",fa+i,dis+i);
deep[i]=deep[fa[i]]+dis[i];
son[fa[i]][d[fa[i]]++]=i;
}
LL l=0,r=1E13,ans=(l+r)>>1;
while(l<r){
lim=ans,dfs(1);
if(dp[1].size())
r=ans;
else
l=ans+1;
ans=(l+r)>>1;
}
printf("%lld\n",ans);
return 0;
}
Submission Info
Submission Time
2018-09-17 21:30:43+0900
Task
E - Shik and Travel
User
wzp
Language
C++14 (GCC 5.4.1)
Score
1400
Code Size
1675 Byte
Status
AC
Exec Time
276 ms
Memory
33512 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:67:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
^
./Main.cpp:69:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",fa+i,dis+i);
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
1400 / 1400
Status
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
8064 KB
001.txt
AC
6 ms
8192 KB
002.txt
AC
6 ms
8192 KB
003.txt
AC
6 ms
8192 KB
004.txt
AC
6 ms
8064 KB
005.txt
AC
6 ms
8192 KB
006.txt
AC
6 ms
8192 KB
007.txt
AC
6 ms
8192 KB
008.txt
AC
6 ms
8192 KB
009.txt
AC
6 ms
8064 KB
010.txt
AC
216 ms
15232 KB
011.txt
AC
214 ms
15232 KB
012.txt
AC
213 ms
15232 KB
013.txt
AC
211 ms
15232 KB
014.txt
AC
219 ms
15232 KB
015.txt
AC
213 ms
15232 KB
016.txt
AC
218 ms
15104 KB
017.txt
AC
214 ms
15232 KB
018.txt
AC
216 ms
15232 KB
019.txt
AC
214 ms
15104 KB
020.txt
AC
217 ms
15232 KB
021.txt
AC
217 ms
15104 KB
022.txt
AC
214 ms
15232 KB
023.txt
AC
217 ms
15232 KB
024.txt
AC
218 ms
15232 KB
025.txt
AC
216 ms
15232 KB
026.txt
AC
189 ms
14592 KB
027.txt
AC
214 ms
15232 KB
028.txt
AC
190 ms
14592 KB
029.txt
AC
189 ms
14592 KB
030.txt
AC
194 ms
14848 KB
031.txt
AC
218 ms
15232 KB
032.txt
AC
211 ms
15104 KB
033.txt
AC
197 ms
14848 KB
034.txt
AC
192 ms
14848 KB
035.txt
AC
218 ms
15104 KB
036.txt
AC
195 ms
14848 KB
037.txt
AC
197 ms
14720 KB
038.txt
AC
194 ms
14848 KB
039.txt
AC
154 ms
14080 KB
040.txt
AC
229 ms
33512 KB
041.txt
AC
270 ms
33512 KB
042.txt
AC
276 ms
33444 KB
043.txt
AC
273 ms
33512 KB
044.txt
AC
178 ms
18176 KB
045.txt
AC
190 ms
16640 KB
046.txt
AC
189 ms
17152 KB
047.txt
AC
197 ms
16768 KB
048.txt
AC
190 ms
17792 KB
049.txt
AC
3 ms
8064 KB
example0.txt
AC
3 ms
8064 KB
example1.txt
AC
3 ms
8064 KB
example2.txt
AC
3 ms
8064 KB
example3.txt
AC
3 ms
8064 KB