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
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
AC × 4
AC × 54
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