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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#76090#5148. Tree DistanceaouiWA 1569ms130180kbC++202.1kb2023-02-07 16:39:352023-02-07 16:39:38

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-02-07 16:39:38]
  • 评测
  • 测评结果:WA
  • 用时:1569ms
  • 内存:130180kb
  • [2023-02-07 16:39:35]
  • 提交

answer

#include<cstdio>
#include<algorithm>
using namespace std;
const int N=2e5+5,M=1e6+5;
int n,m,Q,Si,rt,si[N],tp[N],bz[N],s[N];
long long ans[M],t[N],dep[N];
#include<vector>
vector<pair<int,int> > to[N];
void rfs(int x,int ff)
{
	si[x]=1;
	int ma=0;
	for(auto i:to[x])
	{
		int y=i.first;
		if(y==ff||bz[y])continue;
		rfs(y,x);
		si[x]+=si[y];
		ma=max(ma,si[y]);
	}
	ma=max(ma,m-si[x]);
	if(ma<Si)rt=x,Si=ma;
}
vector<pair<long long,int> > p;
void ifs(int x,int ff,int tt)
{
	tp[x]=tt;
	p.push_back({dep[x],-x});
	for(auto i:to[x])
	{
		int y=i.first,z=i.second;
		if(y==ff||bz[y])continue;
		dep[y]=dep[x]+z;
		ifs(y,x,tt);
	}
}
struct node{int l,r,id;long long x;};
bool cmp(node x,node y){return x.l==y.l?(x.r==y.r?x.id<y.id:x.r<y.r):x.l>y.l;}
vector<node> q;
void sfs(int x)
{
	p.clear();
	p.push_back({dep[x]=0,-x});
	tp[x]=x;
	for(auto i:to[x])
	{
		int y=i.first,z=i.second;
		if(bz[y])continue;
		dep[y]=dep[x]+z;
		ifs(y,x,y);
	}
	sort(p.begin(),p.end());
	s[0]=0;
	for(auto i:p)
	{
		int y=-i.second;
		for(;s[0]&&y<s[s[0]];s[0]--)
			if(tp[s[s[0]]]!=tp[y])q.push_back((node){y,s[s[0]],0,dep[y]+dep[s[s[0]]]});
		if(s[0]&&tp[s[s[0]]]!=tp[y])q.push_back((node){s[s[0]],y,0,dep[y]+dep[s[s[0]]]});
		s[++s[0]]=y;
	}
	bz[x]=1;
	int res=m;
	for(auto i:to[x])
	{
		int y=i.first;
		if(bz[y])continue;
		Si=m=si[y]>si[x]?res-si[x]:si[y];
		rfs(rt=y,0);
		sfs(rt);
	}
}
void add(int x,long long y)
{
	for(;x<=n;x+=x&-x)t[x]=min(t[x],y);
}
long long ask(int x)
{
	long long res=1e18;
	for(;x;x-=x&-x)res=min(res,t[x]);
	return res;
}
int main()
{
	scanf("%d",&n);
	for(int x,y,z,i=1;i<n;i++)
	{
		scanf("%d%d%d",&x,&y,&z);
		to[x].push_back({y,z});
		to[y].push_back({x,z});
	}
	Si=m=n;
	rfs(rt=1,0);
	sfs(rt);
	scanf("%d",&Q);
	for(int l,r,i=1;i<=Q;i++)
	{
		scanf("%d%d",&l,&r);
		q.push_back((node){l,r,i,0});
	}
	sort(q.begin(),q.end(),cmp);
	for(int i=1;i<=n;i++)t[i]=1e18;
	for(auto i:q)
	{
		int l=i.l,r=i.r;
		if(i.id)ans[i.id]=ask(r);
		else add(r,i.x);
	}
	for(int i=1;i<=Q;i++)
		if(ans[i]==1e18)puts("-1");
		else printf("%lld\n",ans[i]);
	return 0;
}

详细

Test #1:

score: 100
Accepted
time: 1ms
memory: 14744kb

input:

5
1 2 5
1 3 3
1 4 4
3 5 2
5
1 1
1 4
2 4
3 4
2 5

output:

-1
3
7
7
2

result:

ok 5 number(s): "-1 3 7 7 2"

Test #2:

score: -100
Wrong Answer
time: 1569ms
memory: 130180kb

input:

199999
31581 23211 322548833
176307 196803 690953895
34430 82902 340232856
36716 77480 466375266
7512 88480 197594480
95680 61864 679567992
19572 14126 599247796
188006 110716 817477802
160165 184035 722372640
23173 188594 490365246
54801 56250 304741654
10103 45884 643490340
127469 154479 214399361...

output:

29573323
-1
4088
65959
4366
-1
760172089
4867978
328055210
-1
35487219223
339719
92126
92126
4366
138216269
8212187
-1
2681285
4366
710854
114886
65959
3099557351
92126
91087
241621631057
26776689
5718199
710854
92126
-1
525277383
92126
710854
92126
710854
4366
-1
-1
16211870
21085
1350361
1350361
4...

result:

wrong answer 2nd numbers differ - expected: '1178569098929', found: '-1'