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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#340166#3307. Query on a Tree 17AFewSunsRE 1ms3532kbC++173.6kb2024-02-28 17:11:422024-02-28 17:11:43

Judging History

你现在查看的是最新测评结果

  • [2024-02-28 17:11:43]
  • 评测
  • 测评结果:RE
  • 用时:1ms
  • 内存:3532kb
  • [2024-02-28 17:11:42]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
#define LC x<<1
#define RC x<<1|1
ll n,q,head[100010],cnt=0;
ll dfn[100010],st[100010],ed[100010],tot=0;
ll wson[100010],dep[100010],f[100010][17],siz[100010],top[100010];
ll tree[400040],lz[400040];
struct node{
	ll nxt,to;
}e[200020];
void add(ll u,ll v){
	e[++cnt].nxt=head[u];
	e[cnt].to=v;
	head[u]=cnt;
}
void dfs1(ll fa,ll u){
	f[u][0]=fa;
	fr(i,1,16) f[u][i]=f[f[u][i-1]][i-1];
	dep[u]=dep[fa]+1;
	siz[u]=1;
	go(u){
		ll v=e[i].to;
		if(v==fa) continue;
		dfs1(u,v);
		siz[u]+=siz[v];
		if(siz[v]>siz[wson[u]]) wson[u]=v;
	}
}
void dfs2(ll u,ll topp){
	top[u]=topp;
	dfn[++tot]=u;
	st[u]=tot;
	if(wson[u]) dfs2(wson[u],topp);
	go(u){
		ll v=e[i].to;
		if(v==f[u][0]) continue;
		if(v!=wson[u]) dfs2(v,v);
	}
	ed[u]=tot;
}
il void pushup(ll x){
	tree[x]=tree[LC]+tree[RC];
}
il void pushdown(ll x,ll l,ll r){
	if(!lz[x]) return;
	ll mid=(l+r)>>1;
	tree[LC]+=(mid-l+1)*lz[x];
	tree[RC]+=(r-mid)*lz[x];
	lz[LC]+=lz[x];
	lz[RC]+=lz[x];
	lz[x]=0;
}
void mdf(ll x,ll l,ll r,ll ql,ll qr){
	if(ql<=l&&r<=qr){
		tree[x]+=r-l+1;
		lz[x]++;
		return;
	}
	ll mid=(l+r)>>1;
	pushdown(x,l,r);
	if(ql<=mid) mdf(LC,l,mid,ql,qr);
	if(mid<qr) mdf(RC,mid+1,r,ql,qr);
	pushup(x);
}
ll querysum(ll x,ll l,ll r,ll ql,ll qr){
	if(ql<=l&&r<=qr) return tree[x];
	ll mid=(l+r)>>1,res=0;
	pushdown(x,l,r);
	if(ql<=mid) res+=querysum(LC,l,mid,ql,qr);
	if(mid<qr) res+=querysum(RC,mid+1,r,ql,qr);
	return res;
}
ll query(ll x,ll l,ll r,ll k){
	if(l==r) return l;
	ll mid=(l+r)>>1;
	pushdown(x,l,r);
	if(tree[LC]>=k) return query(LC,l,mid,k);
	else return query(RC,mid+1,r,k-tree[LC]);
}
il void mdftree(ll x,ll y){
	while(top[x]!=top[y]){
		if(dep[x]<dep[y]) swap(x,y);
		mdf(1,1,n,st[top[x]],st[x]);
		x=f[top[x]][0];
	}
	if(dep[x]>dep[y]) swap(x,y);
	mdf(1,1,n,st[x],st[y]);
}
int main(){
	n=read();
	fr(i,2,n){
		ll u=read(),v=read();
		add(u,v);
		add(v,u);
	}
	dfs1(0,1);
	dfs2(1,1);
	q=read();
	while(q--){
		ll opt=read(),u=read();
		if(opt==1) mdf(1,1,n,st[u],ed[u]);
		else{
			ll v=read();
			mdftree(u,v);
		}
		ll x=dfn[query(1,1,n,tree[1]/2+1)];
		pfr(i,16,0){
			if(!f[x][i]) continue;
			if(querysum(1,1,n,st[f[x][i]],ed[f[x][i]])<=tree[1]/2) x=f[x][i];
		}
		if(f[x][0]&&querysum(1,1,n,st[x],ed[x])<=tree[1]/2) x=f[x][0];
		writeln(x);
	}
}

Details

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Test #1:

score: 100
Accepted
time: 1ms
memory: 3532kb

input:

7
1 6
1 7
7 3
3 2
7 5
5 4
4
1 2
1 4
1 6
2 6 7

output:

2
7
7
1

result:

ok 4 lines

Test #2:

score: -100
Runtime Error

input:

15
1 2
1 3
2 4
3 7
6 2
3 8
4 9
2 5
5 11
7 13
10 4
11 15
12 5
14 7
11
2 6 11
1 6
2 10 9
1 9
2 2 6
1 4
2 7 6
1 2
2 8 13
1 10
2 8 15

output:


result: