diff --git a/src/20241007/training_Eric_cai.cpp b/src/20241007/training_Eric_cai.cpp
index 0ed6a6a..ef1f1f7 100755
--- a/src/20241007/training_Eric_cai.cpp
+++ b/src/20241007/training_Eric_cai.cpp
@@ -1,179 +1,182 @@
-#include<bits/stdc++.h>
-#define ll long long
-using namespace std;
-const int maxn=2e5+5;
-struct node
-{
-    ll mx,sum,t,sv,add,tag,len;
-};
-node tr[maxn<<2];
-int n,q;
-ll d[maxn<<2];
-inline void mdf(int id,int k,ll w)
-{
-    if(k==0)
-    {
-        tr[id].mx+=w;
-        tr[id].t+=w*w*tr[id].len+tr[id].sv*w+tr[id].sum*w;
-        tr[id].sum+=w*tr[id].len;
-        tr[id].sv+=w*tr[id].len;
-        tr[id].add+=w;
-    }
-    if(k==1)
-    {
-        tr[id].mx=w,tr[id].t=w*w*tr[id].len,tr[id].sum=w*tr[id].len,tr[id].sv=w*tr[id].len;
-        tr[id].add=0,tr[id].tag=w;
-    }
-}
-inline void pushdown(int id)
-{
-    if(tr[id].tag)
-    {
-        mdf(id<<1,1,tr[id].tag);
-        mdf(id<<1|1,1,tr[id].tag);
-    }
-    if(tr[id].add)
-    {
-        mdf(id<<1,0,tr[id].add);
-        mdf(id<<1|1,0,tr[id].add);
-    }
-    tr[id].tag=tr[id].add=0;
-}
-node calc(node nd,int id)
-{
-    node ret=nd;
-    if(tr[id].len==1)
-    {
-        ret.mx=max(ret.mx,tr[id].mx);
-        ret.sum+=tr[id].sum;
-        ret.t+=tr[id].sum*ret.mx;
-        ret.sv+=ret.mx;
-        ret.len+=tr[id].len;
-    }
-    else
-    {
-        pushdown(id);
-        if(tr[id<<1].mx>=nd.mx)
-        {
-            ret=calc(nd,id<<1);
-            ret.mx=max(ret.mx,tr[id<<1|1].mx);
-            ret.sum+=tr[id<<1|1].sum;
-            ret.t+=tr[id].t-tr[id<<1].t;
-            ret.sv+=tr[id].sv-tr[id<<1].sv;
-            ret.len+=tr[id<<1|1].len;
-        }
-        else
-        {
-            nd.sum+=tr[id<<1].sum;
-            nd.t+=tr[id<<1].sum*nd.mx;
-            nd.sv+=tr[id<<1].len*nd.mx;
-            nd.len+=tr[id<<1].len;
-            ret=calc(nd,id<<1|1);
-        }
-    }
-    return ret;
-}
-inline void pushup(int id)
-{
-    tr[id]=calc(tr[id<<1],id<<1|1);
-    tr[id].tag=tr[id].add=0;
-}
-void build(int id,int l,int r)
-{
-    if(l==r)
-    {
-        tr[id]=(node){d[l],d[l],d[l]*d[l],d[l],0,0,1};
-        return;
-    }
-    int mid=(l+r)>>1;
-    build(id<<1,l,mid);
-    build(id<<1|1,mid+1,r);
-    pushup(id);
-}
-void update(int id,int l,int r,int x,int y,int k,ll w)
-{
-    if(l>=x && r<=y)
-    {
-        mdf(id,k,w);
-        return;
-    }
-    int mid=(l+r)>>1;
-    pushdown(id);
-    if(x<=mid) update(id<<1,l,mid,x,y,k,w);
-    if(y>mid) update(id<<1|1,mid+1,r,x,y,k,w);
-    pushup(id);
-}
-int num[maxn],cnt,L[maxn],R[maxn];
-void get_num(int id,int l,int r,int x,int y)
-{
-    if(l>=x && r<=y)
-    {
-        cnt++;
-        num[cnt]=id,L[cnt]=l,R[cnt]=r;
-        return;
-    }
-    int mid=(l+r)>>1;
-    pushdown(id);
-    if(x<=mid) get_num(id<<1,l,mid,x,y);
-    if(y>mid) get_num(id<<1|1,mid+1,r,x,y);
-}
-int get_pos(int id,int l,int r,node nd,ll t)
-{
-    if(l==r) return l;
-    int mid=(l+r)>>1;
-    pushdown(id);
-    node dt=calc(nd,id<<1);
-    if(dt.t<=t) return get_pos(id<<1|1,mid+1,r,dt,t);
-    else return get_pos(id<<1,l,mid,nd,t);
-}
-int main()
-{
-    //system("fc training.out training6.ans /W");
-    //return 0;
-    ios::sync_with_stdio(0);
-    cin.tie(0);cout.tie(0);
-    //freopen("training6.in","r",stdin);
-    //freopen("training.out","w",stdout);
-    int fl;
-    node nd,dt;
-    char opt;
-    ll s,t,w;
-    cin>>n>>q;
-    for(int i=0;i<n;i++) cin>>d[i];
-    build(1,0,n-1);
-    while(q--)
-    {
-        cin>>opt>>s>>t;
-        if(opt=='P')
-        {
-            cin>>w;
-            if(s<=t) update(1,0,n-1,s,t,0,w);
-            else update(1,0,n-1,0,t,0,w),update(1,0,n-1,s,n-1,0,w);
-        }
-        if(opt=='R')
-        {
-            cin>>w;
-            if(s<=t) update(1,0,n-1,s,t,1,w);
-            else update(1,0,n-1,0,t,1,w),update(1,0,n-1,s,n-1,1,w);
-        }
-        if(opt=='Q')
-        {
-            fl=0,cnt=0,nd=(node){0,0,0,0,0,0,0};
-            get_num(1,0,n-1,s,n-1);
-            get_num(1,0,n-1,0,n-1);
-            for(int i=1;i<=cnt;i++)
-            {
-                dt=calc(nd,num[i]);
-                if(dt.t>t)
-                {
-                    fl=1;
-                    cout<<get_pos(num[i],L[i],R[i],nd,t)<<'\n';
-                    break;
-                }
-                nd=dt;
-            }
-            if(fl==0) cout<<get_pos(1,0,n-1,nd,(t-nd.t)%(tr[1].sum*tr[1].mx)+nd.t)<<'\n';
-        }
-    }
-    return 0;
-}
+// #include<bits/stdc++.h>
+// #define ll long long
+// using namespace std;
+// const int maxn=2e5+5;
+// struct node
+// {
+//     ll mx,sum,t,sv,add,tag,len;
+// };
+// node tr[maxn<<2];
+// int n,q;
+// ll d[maxn<<2];
+// inline void mdf(int id,int k,ll w)
+// {
+//     if(k==0)
+//     {
+//         tr[id].mx+=w;
+//         tr[id].t+=w*w*tr[id].len+tr[id].sv*w+tr[id].sum*w;
+//         tr[id].sum+=w*tr[id].len;
+//         tr[id].sv+=w*tr[id].len;
+//         tr[id].add+=w;
+//     }
+//     if(k==1)
+//     {
+//         tr[id].mx=w,tr[id].t=w*w*tr[id].len,tr[id].sum=w*tr[id].len,tr[id].sv=w*tr[id].len;
+//         tr[id].add=0,tr[id].tag=w;
+//     }
+// }
+// inline void pushdown(int id)
+// {
+//     if(tr[id].tag)
+//     {
+//         mdf(id<<1,1,tr[id].tag);
+//         mdf(id<<1|1,1,tr[id].tag);
+//     }
+//     if(tr[id].add)
+//     {
+//         mdf(id<<1,0,tr[id].add);
+//         mdf(id<<1|1,0,tr[id].add);
+//     }
+//     tr[id].tag=tr[id].add=0;
+// }
+// node calc(node nd,int id)
+// {
+//     node ret=nd;
+//     if(tr[id].len==1)
+//     {
+//         ret.mx=max(ret.mx,tr[id].mx);
+//         ret.sum+=tr[id].sum;
+//         ret.t+=tr[id].sum*ret.mx;
+//         ret.sv+=ret.mx;
+//         ret.len+=tr[id].len;
+//     }
+//     else
+//     {
+//         pushdown(id);
+//         if(tr[id<<1].mx>=nd.mx)
+//         {
+//             ret=calc(nd,id<<1);
+//             ret.mx=max(ret.mx,tr[id<<1|1].mx);
+//             ret.sum+=tr[id<<1|1].sum;
+//             ret.t+=tr[id].t-tr[id<<1].t;
+//             ret.sv+=tr[id].sv-tr[id<<1].sv;
+//             ret.len+=tr[id<<1|1].len;
+//         }
+//         else
+//         {
+//             nd.sum+=tr[id<<1].sum;
+//             nd.t+=tr[id<<1].sum*nd.mx;
+//             nd.sv+=tr[id<<1].len*nd.mx;
+//             nd.len+=tr[id<<1].len;
+//             ret=calc(nd,id<<1|1);
+//         }
+//     }
+//     return ret;
+// }
+// inline void pushup(int id)
+// {
+//     tr[id]=calc(tr[id<<1],id<<1|1);
+//     tr[id].tag=tr[id].add=0;
+// }
+// void build(int id,int l,int r)
+// {
+//     if(l==r)
+//     {
+//         tr[id]=(node){d[l],d[l],d[l]*d[l],d[l],0,0,1};
+//         return;
+//     }
+//     int mid=(l+r)>>1;
+//     build(id<<1,l,mid);
+//     build(id<<1|1,mid+1,r);
+//     pushup(id);
+// }
+// void update(int id,int l,int r,int x,int y,int k,ll w)
+// {
+//     if(l>=x && r<=y)
+//     {
+//         mdf(id,k,w);
+//         return;
+//     }
+//     int mid=(l+r)>>1;
+//     pushdown(id);
+//     if(x<=mid) update(id<<1,l,mid,x,y,k,w);
+//     if(y>mid) update(id<<1|1,mid+1,r,x,y,k,w);
+//     pushup(id);
+// }
+// int num[maxn],cnt,L[maxn],R[maxn];
+// void get_num(int id,int l,int r,int x,int y)
+// {
+//     if(l>=x && r<=y)
+//     {
+//         cnt++;
+//         num[cnt]=id,L[cnt]=l,R[cnt]=r;
+//         return;
+//     }
+//     int mid=(l+r)>>1;
+//     pushdown(id);
+//     if(x<=mid) get_num(id<<1,l,mid,x,y);
+//     if(y>mid) get_num(id<<1|1,mid+1,r,x,y);
+// }
+// int get_pos(int id,int l,int r,node nd,ll t)
+// {
+//     if(l==r) return l;
+//     int mid=(l+r)>>1;
+//     pushdown(id);
+//     node dt=calc(nd,id<<1);
+//     if(dt.t<=t) return get_pos(id<<1|1,mid+1,r,dt,t);
+//     else return get_pos(id<<1,l,mid,nd,t);
+// }
+// int main()
+// {
+//     //system("fc training.out training6.ans /W");
+//     //return 0;
+//     ios::sync_with_stdio(0);
+//     cin.tie(0);cout.tie(0);
+//     //freopen("training6.in","r",stdin);
+//     //freopen("training.out","w",stdout);
+//     int fl;
+//     node nd,dt;
+//     char opt;
+//     ll s,t,w;
+//     cin>>n>>q;
+//     for(int i=0;i<n;i++) cin>>d[i];
+//     build(1,0,n-1);
+//     while(q--)
+//     {
+//         cin>>opt>>s>>t;
+//         if(opt=='P')
+//         {
+//             cin>>w;
+//             if(s<=t) update(1,0,n-1,s,t,0,w);
+//             else update(1,0,n-1,0,t,0,w),update(1,0,n-1,s,n-1,0,w);
+//         }
+//         if(opt=='R')
+//         {
+//             cin>>w;
+//             if(s<=t) update(1,0,n-1,s,t,1,w);
+//             else update(1,0,n-1,0,t,1,w),update(1,0,n-1,s,n-1,1,w);
+//         }
+//         if(opt=='Q')
+//         {
+//             fl=0,cnt=0,nd=(node){0,0,0,0,0,0,0};
+//             get_num(1,0,n-1,s,n-1);
+//             get_num(1,0,n-1,0,n-1);
+//             for(int i=1;i<=cnt;i++)
+//             {
+//                 dt=calc(nd,num[i]);
+//                 if(dt.t>t)
+//                 {
+//                     fl=1;
+//                     cout<<get_pos(num[i],L[i],R[i],nd,t)<<'\n';
+//                     break;
+//                 }
+//                 nd=dt;
+//             }
+//             if(fl==0) cout<<get_pos(1,0,n-1,nd,(t-nd.t)%(tr[1].sum*tr[1].mx)+nd.t)<<'\n';
+//         }
+//     }
+//     return 0;
+// }
+int main(){
+    
+}
\ No newline at end of file
diff --git a/src/20241007/training_Lonely_Christmas.cpp b/src/20241007/training_Lonely_Christmas.cpp
index b0efb11..4d45678 100755
--- a/src/20241007/training_Lonely_Christmas.cpp
+++ b/src/20241007/training_Lonely_Christmas.cpp
@@ -1,202 +1,3 @@
-#include<bits/stdc++.h>
-using namespace std;
-typedef long long ll;
-const int N=200001;
-int n,q;
-int a[N];
-struct node{
-    int mx;
-    ll sm,smx,tt;
-    int tg1,tg2;
-}t[N*4];
-#define ls (p<<1)
-#define rs (p<<1|1)
-#define mid (l+r>>1)
-void build(int p,int l,int r){
-    for(int i=l;i<=r;i++){
-        t[p].mx=max(t[p].mx,a[i]);
-        t[p].sm+=a[i];
-        t[p].smx+=t[p].mx;
-        t[p].tt+=1ll*t[p].mx*a[i];
-    }
-    if(l==r)return;
-    build(ls,l,mid);
-    build(rs,mid+1,r);
-}
-void pushdown(int p,int l,int r){
-    int tg;
-    if(t[p].tg1){
-        tg=t[p].tg1;
-        t[p].tg1=0;
-        t[ls].mx=t[rs].mx=tg;
-        t[ls].sm=1ll*(mid-l+1)*tg,t[rs].sm=1ll*(r-mid)*tg;
-        t[ls].smx=t[ls].sm,t[rs].smx=t[rs].sm;
-        t[ls].tt=t[ls].sm*tg,t[rs].tt=t[rs].sm*tg;
-        t[ls].tg1=t[rs].tg1=tg;
-        t[ls].tg2=t[rs].tg2=0;
-    }
-    if(t[p].tg2){
-        tg=t[p].tg2;
-        t[p].tg2=0;
-        t[ls].mx+=tg,t[rs].mx+=tg;
-        t[ls].tt+=tg*(1ll*tg*(mid-l+1)+t[ls].sm+t[ls].smx),t[rs].tt+=tg*(1ll*tg*(r-mid)+t[rs].sm+t[rs].smx);
-        t[ls].sm+=1ll*(mid-l+1)*tg,t[rs].sm+=1ll*(r-mid)*tg;
-        t[ls].smx+=1ll*(mid-l+1)*tg,t[rs].smx+=1ll*(r-mid)*tg;
-        t[ls].tg2+=tg,t[rs].tg2+=tg;
-    }
-}
-int qmx;
-ll qsmx,qtt;
-void query(int p,int l,int r){
-    if(l==r){
-        if(qmx>t[p].mx)qsmx+=qmx,qtt+=qmx*t[p].sm;
-        else qsmx+=t[p].mx,qtt+=t[p].tt,qmx=t[p].mx;
-        return;
-    }
-    pushdown(p,l,r);
-    if(qmx>t[ls].mx){
-        qsmx+=1ll*qmx*(mid-l+1);
-        qtt+=qmx*t[ls].sm;
-        query(rs,mid+1,r);
-    }
-    else{
-        qsmx+=t[p].smx-t[ls].smx;
-        qtt+=t[p].tt-t[ls].tt;
-        query(ls,l,mid);
-        qmx=t[p].mx;
-    }
-}
-void update(int p,int l,int r){
-    t[p].mx=max(t[ls].mx,t[rs].mx);
-    t[p].sm=t[ls].sm+t[rs].sm;
-    qmx=t[ls].mx;
-    qsmx=t[ls].smx;
-    qtt=t[ls].tt;
-    query(rs,mid+1,r);
-    t[p].smx=qsmx;
-    t[p].tt=qtt;
-}
-void modify1(int p,int l,int r,int x,int y,int d){
-    if(x<=l&&r<=y){
-        t[p].mx=d;
-        t[p].sm=1ll*(r-l+1)*d;
-        t[p].smx=t[p].sm;
-        t[p].tt=t[p].sm*d;
-        t[p].tg1=d;
-        t[p].tg2=0;
-        return;
-    }
-    pushdown(p,l,r);
-    if(x<=mid)modify1(ls,l,mid,x,y,d);
-    if(mid<y)modify1(rs,mid+1,r,x,y,d);
-    update(p,l,r);
-}
-void modify2(int p,int l,int r,int x,int y,int d){
-    if(x<=l&&r<=y){
-        t[p].mx+=d;
-        t[p].tt+=d*(1ll*d*(r-l+1)+t[p].sm+t[p].smx);
-        t[p].sm+=1ll*(r-l+1)*d;
-        t[p].smx+=1ll*(r-l+1)*d;
-        t[p].tg2+=d;
-        return;
-    }
-    pushdown(p,l,r);
-    if(x<=mid)modify2(ls,l,mid,x,y,d);
-    if(mid<y)modify2(rs,mid+1,r,x,y,d);
-    update(p,l,r);
-}
-struct seg{
-    int p,l,r;
-}b[100];
-int m;
-void getseg(int p,int l,int r,int x,int y){
-    if(x<=l&&r<=y){
-        b[++m]=(seg){p,l,r};
-        return;
-    }
-    pushdown(p,l,r);
-    if(x<=mid)getseg(ls,l,mid,x,y);
-    if(mid<y)getseg(rs,mid+1,r,x,y);
-}
-int gettt(int p,int l,int r,ll tm){
-    if(l==r){
-        query(p,l,r);
-        if(qtt>tm)return l-1;
-        return l;
-    }
-    pushdown(p,l,r);
-    int mx=qmx;
-    ll tt=qtt;
-    query(ls,l,mid);
-    if(qtt>tm){
-        qmx=mx,qtt=tt;
-        return gettt(ls,l,mid,tm);
-    }
-    return gettt(rs,mid+1,r,tm);
-}
-int getsm(int p,int l,int r,ll tm){
-    if(l==r){
-        if(t[p].sm>tm)return l-1;
-        return l;
-    }
-    pushdown(p,l,r);
-    if(t[ls].sm>tm)return getsm(ls,l,mid,tm);
-    return getsm(rs,mid+1,r,tm-t[ls].sm);
-}
 int main(){
-    ios::sync_with_stdio(0);
-    cin.tie(0),cout.tie(0);
-    cin>>n>>q;
-    for(int i=0;i<n;i++)cin>>a[i];
-    build(1,0,n-1);
-    while(q--){
-        char op[2];
-        cin>>op;
-        if(op[0]=='R'){
-            int l,r,d;
-            cin>>l>>r>>d;
-            if(l<=r)modify1(1,0,n-1,l,r,d);
-            else modify1(1,0,n-1,l,n-1,d),modify1(1,0,n-1,0,r,d);
-        }
-        if(op[0]=='P'){
-            int l,r,d;
-            cin>>l>>r>>d;
-            if(l<=r)modify2(1,0,n-1,l,r,d);
-            else modify2(1,0,n-1,l,n-1,d),modify2(1,0,n-1,0,r,d);
-        }
-        if(op[0]=='Q'){
-            int s;
-            ll tm;
-            cin>>s>>tm;
-            m=0;
-            getseg(1,0,n-1,s,n-1);
-            if(s)getseg(1,0,n-1,0,s-1);
-            bool flag=0;
-            int mx=0;
-            ll tt=0;
-            for(int i=1;i<=m;i++){
-                qmx=mx,qtt=tt;
-                query(b[i].p,b[i].l,b[i].r);
-                if(qtt>tm){
-                    qmx=mx,qtt=tt;
-                    cout<<(gettt(b[i].p,b[i].l,b[i].r,tm)+1)%n<<'\n';
-                    flag=1;
-                    break;
-                }
-                mx=qmx,tt=qtt;
-            }
-            if(flag)continue;
-            tm-=qtt;
-            tm/=t[1].mx;
-            tm%=t[1].sm;
-            for(int i=1;i<=m;i++){
-                if(t[b[i].p].sm>tm){
-                    cout<<(getsm(b[i].p,b[i].l,b[i].r,tm)+1)%n<<'\n';
-                    break;
-                }
-                tm-=t[b[i].p].sm;
-            }
-        }
-    }
-    return 0;
-}
+    
+}
\ No newline at end of file
diff --git a/src/P1395/P1395.cpp b/src/P1395/P1395.cpp
index eb8caa1..dbfebd9 100644
--- a/src/P1395/P1395.cpp
+++ b/src/P1395/P1395.cpp
@@ -1,9 +1,11 @@
 #include <cstdint>
 #include <iostream>
+#include <queue>
 #include <vector>
 
 using ll = int64_t;
 using vl = std::vector<ll>;
+#define N(v)#v<<" :"<<(v)<<" "
 auto &ci = std::cin;
 auto &co = std::cout;
 
@@ -12,10 +14,10 @@ ll *sn = new ll[max_n];
 auto *nds = new vl[max_n];
 
 void dfs(ll ft, ll n){
-    if(nds[n].size()<=1){
+    sn[n]=1;
+    if(nds[n].size()==1 && nds[n][0]==ft){
         return;
     }
-    sn[n]=1;
     for(ll i:nds[n]){
         if(i==ft){
             continue;
@@ -35,6 +37,43 @@ int main(){
         nds[a].push_back(b);
         nds[b].push_back(a);
     }
-    for(ll i{1};i<=n;i++)co<<sn[i]<<' ';
-    co<<'\n';
+    dfs(0, 1);
+    
+    ll now{1};
+    ll nxt{}, nn{-1};
+    ll f{1};
+    for(ll i:nds[now]){
+        if(sn[i]>nn && i!=now){
+            nn = sn[i];
+            nxt = i;
+        }
+    }
+    co<<"nxt: "<<nxt<<" now: "<<now<<"\n";
+    ll t{sn[1]-sn[nxt]};
+    ll b{sn[nxt]-1};
+    
+    // ll fsn{sn[1]};
+    // co<<"t "<<t<<" b "<<b<<'\n';
+    ll ft{t}, fb{b};
+    while(t<b){
+        if(nds[now].size()==0)break;
+        f = now;
+        now = nxt;
+        nn = -1;
+        for(ll i{0}; i<nds[now].size(); i++){
+            for(ll i:nds[now]){
+                if(sn[i]>nn && i!=f){
+                    nn = sn[i];
+                    nxt = i;
+                }
+            }
+        }
+        ft=t, fb = b;
+        t+=(sn[now]-sn[nxt]);
+        b = sn[nxt]-1;
+        co<<"now: "<<now<<" nxt:"<<nxt<<" t: "<<t<<" b:"<<b<<'\n';
+    }
+
+    // co<<N(ft)<<N(fb)<<N(now)<<N(nxt)<<'\n';
+    
 }
\ No newline at end of file