#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fr first
#define sc second
const int mxn=5e5+5,M=1e9+7,kkk=(1<<21);
ll n,q,r,st[mxn],fn[mxn],cnt=0,sz[mxn],g[mxn],bbb;
ll ans,fuck[mxn*2],rfuck[mxn*2];
vector<ll>v[mxn];
ll ferma(ll x){
ll num=M-2,res=1;
while(num){
if(num&1)res=(res*x)%M;
x=(x*x)%M;
num>>=1;
}
return res;
}
void dfs(ll z){
sz[z]=1;
st[z]=++cnt;
for(auto i:v[z]){
if(!st[i]){
dfs(i);
sz[z]+=sz[i];
}
}
fn[z]=cnt;
}
void make(){
fuck[0]=rfuck[0]=1;
for(ll i=1;i<=n+r;i++){
fuck[i]=(fuck[i-1]*i)%M;
rfuck[i]=ferma(fuck[i]);
}
}
ll comb(ll x,ll y,bool w){
if(x>y){
bbb+=(w)?-1:1;
return 1;
}
ll res=fuck[y]*rfuck[x];
res%=M;
res*=rfuck[y-x];
return res%M;
}
struct segment{
ll val[kkk];
void up(ll id,ll L,ll R,ll l,ll x){
if(L+1==R){
val[id]=x;
return;
}
ll mid=(L+R)/2;
if(l<mid)
up(id*2,L,mid,l,x);
else
up(id*2+1,mid,R,l,x);
val[id]=val[id*2]+val[id*2+1];
}
ll get(ll id ,ll L,ll R,ll l,ll r){
if(L==l && R==r)
return val[id];
ll mid=(L+R)/2;
ll res=0;
if(l<mid)
res+=get(id*2,L,mid,l,min(r,mid));
if(r>mid)
res+=get(id*2+1,mid,R,max(l,mid),r);
return res;
}
}seg[2];
struct fnd{
set<ll>s[kkk];
ll get(ll id,ll L,ll R,ll l,ll r){
if(L==l && R==r)
return ((s[id].size())?*s[id].rbegin():0);
ll mid=(L+R)/2,res=((s[id].size())?*s[id].rbegin():0),x=0;
if(l<mid){
x=get(id*2,L,mid,l,min(r,mid));
}
return (x)?x:res;
}
void add(ll id ,ll L,ll R,ll l,ll r,ll x,bool y){
if(L==l && R==r){
if(y)
s[id].insert(x);
else
s[id].erase(x);
return;
}
ll mid=(L+R)/2;
if(l<mid)
add(id*2,L,mid,l,min(r,mid),x,y);
if(r>mid)
add(id*2+1,mid,R,max(l,mid),r,x,y);
}
}fnd;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n>>r;
for(ll i=1;i<n;i++){
ll x,y;
cin>>x>>y;
v[x].push_back(y);
v[y].push_back(x);
}
dfs(1);
make();
ans=comb(n-1,n+r-1,0);
seg[0].up(1,1,n+1,1,n);
seg[1].up(1,1,n+1,1,r);
fnd.add(1,1,n+1,1,n+1,1,1);
g[1]=r;
cout<<ans<<'\n';
cin>>q;
while(q--){
ll ty,x,y,z=1;
cin>>ty;
if(ty==1){
cin>>x>>g[x];
z=fnd.get(1,1,n+1,st[x],fn[x]+1);
fnd.add(1,1,n+1,st[x],fn[x]+1,st[x],1);
}
else{
cin>>x;
fnd.add(1,1,n+1,st[x],fn[x]+1,st[x],0);
z=fnd.get(1,1,n+1,st[x],fn[x]+1);
}
ll t1=seg[0].get(1,1,n+1,st[x],fn[x]+1)-seg[0].get(1,1,n+1,st[x],st[x]+1);
ll t2=seg[0].get(1,1,n+1,st[z],fn[z]+1)-seg[0].get(1,1,n+1,st[z],st[z]+1);
ll v1=seg[1].get(1,1,n+1,st[x],fn[x]+1);
ll v2=seg[1].get(1,1,n+1,st[z],fn[z]+1);
if(ty==1){
ll sz1=sz[x]-t1;
ll sz2=sz[z]-t2-sz1;
//seg[0].up(1,1,n+1,st[x],sz1);
//seg[0].up(1,1,n+1,st[z],sz2);
ans*=ferma(comb(sz[z]-t2-1,sz[z]-t2+v2-1,1));
ans%=M;
//cout<<comb(sz[z]-t2-1,sz[z]-t2+v2-1,1)<<" ";
ll val1=comb(sz1-1,sz1-1+g[x]-v1,0);
ll val2=comb(sz2-1,sz2-1+v2-g[x]+v1,0);
ans*=val1;
ans%=M;
ans*=val2;
ans%=M;
//seg[1].up(1,1,n+1,st[x],g[x]-v1-v1);
//seg[1].up(1,1,n+1,st[z],0);
ll w=seg[1].get(1,1,n+1,st[z],fn[z]+1);
//seg[1].up(1,1,n+1,st[z],g[z]-w-w);
}
else{
ll sz1=sz[x]-t1;
ll sz2=sz[z]-t2+sz1;
seg[0].up(1,1,n+1,st[x],0);
seg[0].up(1,1,n+1,st[z],sz2);
//cout<<v1<<" "<<v2<<'\n';
ans*=ferma(comb(sz1-1,sz1+v1-1,1));
ans%=M;
ans*=ferma(comb(sz[z]-t2-1,sz[z]-t2+v2-1,1));
ans%=M;
ll val1=comb(sz2-1,sz2-1+v2+v1,0);
ans*=val1;
ans%=M;
seg[1].up(1,1,n+1,st[x],0);
seg[1].up(1,1,n+1,st[z],0);
ll w=seg[1].get(1,1,n+1,st[z],fn[z]+1);
seg[1].up(1,1,n+1,st[z],g[z]-w-w);
}
if(bbb){
cout<<0<<'\n';
}
else
cout<<ans<<'\n';
}
return 0;
}
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:154:7: warning: unused variable 'w' [-Wunused-variable]
154 | ll w=seg[1].get(1,1,n+1,st[z],fn[z]+1);
| ^
Main.cpp:120:11: warning: unused variable 'y' [-Wunused-variable]
120 | ll ty,x,y,z=1;
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
163 ms |
138580 KB |
Output is correct |
| 2 |
Correct |
146 ms |
136416 KB |
Output is correct |
| 3 |
Correct |
140 ms |
135248 KB |
Output is correct |
| 4 |
Correct |
165 ms |
138012 KB |
Output is correct |
| 5 |
Correct |
158 ms |
133716 KB |
Output is correct |
| 6 |
Correct |
80 ms |
115792 KB |
Output is correct |
| 7 |
Correct |
81 ms |
115576 KB |
Output is correct |
| 8 |
Correct |
64 ms |
113452 KB |
Output is correct |
| 9 |
Correct |
169 ms |
132488 KB |
Output is correct |
| 10 |
Correct |
168 ms |
132840 KB |
Output is correct |
| 11 |
Correct |
170 ms |
132936 KB |
Output is correct |
| 12 |
Correct |
131 ms |
128596 KB |
Output is correct |
| 13 |
Correct |
166 ms |
136528 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
42 ms |
110640 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
207 ms |
142180 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
420 ms |
144288 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
163 ms |
138580 KB |
Output is correct |
| 2 |
Correct |
146 ms |
136416 KB |
Output is correct |
| 3 |
Correct |
140 ms |
135248 KB |
Output is correct |
| 4 |
Correct |
165 ms |
138012 KB |
Output is correct |
| 5 |
Correct |
158 ms |
133716 KB |
Output is correct |
| 6 |
Correct |
80 ms |
115792 KB |
Output is correct |
| 7 |
Correct |
81 ms |
115576 KB |
Output is correct |
| 8 |
Correct |
64 ms |
113452 KB |
Output is correct |
| 9 |
Correct |
169 ms |
132488 KB |
Output is correct |
| 10 |
Correct |
168 ms |
132840 KB |
Output is correct |
| 11 |
Correct |
170 ms |
132936 KB |
Output is correct |
| 12 |
Correct |
131 ms |
128596 KB |
Output is correct |
| 13 |
Correct |
166 ms |
136528 KB |
Output is correct |
| 14 |
Incorrect |
42 ms |
110640 KB |
Output isn't correct |
| 15 |
Halted |
0 ms |
0 KB |
- |
