树套树乱讲的代码
由于部分代码的完成时间较早所以码风可能有些差异，敬请谅解。
动态区间Kth
#include<cstdio>
#include<cstring>
#include<cmath>
#include<iostream>
#include<algorithm>
using namespace std;
const int N=10005;
struct segment_tree{int v;int ls,rs;}t[N*200];
struct operation{bool b;int l,r,k;int pos,t;}q[N];
int n,m,a[N],o[N<<1],rt[N],len,tot,temp[2][20],cnt[2];
char opt;
void Modify(int &now,int l,int r,int pos,int val)
{
if (!now) now=++tot;
t[now].v+=val;
if (l==r) return;
int mid=l+r>>1;
if (pos<=mid) Modify(t[now].ls,l,mid,pos,val);
else Modify(t[now].rs,mid+1,r,pos,val);
}
void PreModify(int x,int val)
{
int k=lower_bound(o+1,o+len+1,a[x])-o;
for (int i=x;i<=n;i+=i&-i) Modify(rt[i],1,len,k,val);
}
int Query(int l,int r,int k)
{
if (l==r) return l;
int mid=l+r>>1,sum=0;
for (int i=1;i<=cnt[1];i++) sum+=t[t[temp[1][i]].ls].v;
for (int i=1;i<=cnt[0];i++) sum-=t[t[temp[0][i]].ls].v;
if (k<=sum)
{
for (int i=1;i<=cnt[1];i++) temp[1][i]=t[temp[1][i]].ls;
for (int i=1;i<=cnt[0];i++) temp[0][i]=t[temp[0][i]].ls;
return Query(l,mid,k);
}
else
{
for (int i=1;i<=cnt[1];i++) temp[1][i]=t[temp[1][i]].rs;
for (int i=1;i<=cnt[0];i++) temp[0][i]=t[temp[0][i]].rs;
return Query(mid+1,r,k-sum);
}
}
int PreQuery(int l,int r,int k)
{
memset(temp,0,sizeof(temp));
cnt[0]=cnt[1]=0;
for (int i=r;i;i-=i&-i) temp[1][++cnt[1]]=rt[i];
for (int i=l-1;i;i-=i&-i) temp[0][++cnt[0]]=rt[i];
return Query(1,len,k);
}
int main()
{
ios::sync_with_stdio(false);
cin>>n>>m;
for (int i=1;i<=n;i++) cin>>a[i],o[++len]=a[i];
for (int i=1;i<=m;i++)
{
cin>>opt;
q[i].b=(opt=='Q');
if (q[i].b) cin>>q[i].l>>q[i].r>>q[i].k;
else cin>>q[i].pos>>q[i].t,o[++len]=q[i].t;
}
sort(o+1,o+len+1);
len=unique(o+1,o+len+1)-o-1;
for (int i=1;i<=n;i++) PreModify(i,1);
for (int i=1;i<=m;i++)
{
if (q[i].b)
printf("%d
",o[PreQuery(q[i].l,q[i].r,q[i].k)]);
else
{
PreModify(q[i].pos,-1);
a[q[i].pos]=q[i].t;
PreModify(q[i].pos,1);
}
}
return 0;
}
三维偏序（陌上花开）
#include<cstdio>
#include<algorithm>
using namespace std;
int gi()
{
int x=0,w=1;char ch=getchar();
while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar();
if (ch=='-') w=0,ch=getchar();
while (ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();
return w?x:-x;
}
const int N = 200005;
struct node{
int a,b,c,cnt,ans;
bool operator < (const node &zsy) const
{
if (a!=zsy.a) return a<zsy.a;
if (b!=zsy.b) return b<zsy.b;
return c<zsy.c;
}
bool operator == (const node &zsy) const
{return a==zsy.a&&b==zsy.b&&c==zsy.c;}
}p[N],q[N];
struct segment_tree{int ls,rs,sum;}t[N*200];
int n,k,m,rt[N],cnt,tot[N];
void modify(int &x,int l,int r,int p,int v)
{
if (!x) x=++cnt;t[x].sum+=v;
if (l==r) return; int mid=l+r>>1;
if (p<=mid) modify(t[x].ls,l,mid,p,v);
else modify(t[x].rs,mid+1,r,p,v);
}
int query(int x,int l,int r,int ql,int qr)
{
if (!x||(l>=ql&&r<=qr)) return t[x].sum;
int mid=l+r>>1,s=0;
if (ql<=mid) s+=query(t[x].ls,l,mid,ql,qr);
if (qr>mid) s+=query(t[x].rs,mid+1,r,ql,qr);
return s;
}
int main()
{
n=gi();k=gi();
for (int i=1;i<=n;++i)
p[i]=(node){gi(),gi(),gi()};
sort(p+1,p+n+1);
for (int i=1;i<=n;++i)
if (p[i]==q[m]) ++q[m].cnt;
else q[++m]=p[i],q[m].cnt=1;
for (int i=1;i<=m;++i)
{
for (int j=q[i].b;j;j-=j&-j)
q[i].ans+=query(rt[j],1,k,1,q[i].c);
tot[q[i].ans+q[i].cnt-1]+=q[i].cnt;
for (int j=q[i].b;j<=k;j+=j&-j)
modify(rt[j],1,k,q[i].c,q[i].cnt);
}
for (int i=0;i<n;++i)
printf("%d
",tot[i]);
return 0;
}
二逼树套树
#include<cstdio>
#include<algorithm>
using namespace std;
const int N = 50005;
struct tree{int ls,rs,num;}t[N*200];
struct query{int opt,l,r,pos,k;}q[N];
int n,m,a[N],o[N<<1],len,rt[N],tot,temp[2][20],cnt[2];
int gi()
{
int x=0,w=1;char ch=getchar();
while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar();
if (ch=='-') w=0,ch=getchar();
while (ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();
return w?x:-x;
}
void Modify(int &x,int l,int r,int pos,int v)
{
if (!x) x=++tot;
t[x].num+=v;
if (l==r) return;
int mid=l+r>>1;
if (pos<=mid) Modify(t[x].ls,l,mid,pos,v);else Modify(t[x].rs,mid+1,r,pos,v);
}
int Query(int x,int l,int r,int ql,int qr)
{
if (l>=ql&&r<=qr) return t[x].num;
int mid=l+r>>1,s=0;
if (ql<=mid) s+=Query(t[x].ls,l,mid,ql,qr);
if (qr>mid) s+=Query(t[x].rs,mid+1,r,ql,qr);
return s;
}
int Find(int l,int r,int k)
{
if (l==r) return l;
int mid=l+r>>1,sum=0;
for (int i=1;i<=cnt[1];i++) sum+=t[t[temp[1][i]].ls].num;
for (int i=1;i<=cnt[0];i++) sum-=t[t[temp[0][i]].ls].num;
if (k<=sum)
{
for (int i=1;i<=cnt[1];i++) temp[1][i]=t[temp[1][i]].ls;
for (int i=1;i<=cnt[0];i++) temp[0][i]=t[temp[0][i]].ls;
return Find(l,mid,k);
}
else
{
for (int i=1;i<=cnt[1];i++) temp[1][i]=t[temp[1][i]].rs;
for (int i=1;i<=cnt[0];i++) temp[0][i]=t[temp[0][i]].rs;
return Find(mid+1,r,k-sum);
}
}
void Update(int pos,int v)
{
for (int i=pos;i<=n;i+=i&-i)
Modify(rt[i],1,len,a[pos],v);
}
int Sum(int l,int r,int ql,int qr)
{
if (ql>qr) return 0;
int sum=0;
for (int j=r;j;j-=j&-j) sum+=Query(rt[j],1,len,ql,qr);
for (int j=l-1;j;j-=j&-j) sum-=Query(rt[j],1,len,ql,qr);
return sum;
}
int Rank(int l,int r,int k)
{
cnt[1]=cnt[0]=0;
for (int j=r;j;j-=j&-j) temp[1][++cnt[1]]=rt[j];
for (int j=l-1;j;j-=j&-j) temp[0][++cnt[0]]=rt[j];
return o[Find(1,len,k)];
}
int main()
{
n=gi();m=gi();
for (int i=1;i<=n;i++) o[++len]=a[i]=gi();
for (int i=1;i<=m;i++)
{
q[i].opt=gi();
if (q[i].opt!=3) q[i].l=gi(),q[i].r=gi();
else q[i].pos=gi();
q[i].k=gi();
if (q[i].opt!=2) o[++len]=q[i].k;
}
sort(o+1,o+len+1);
len=unique(o+1,o+len+1)-o-1;
for (int i=1;i<=n;i++)
{
a[i]=lower_bound(o+1,o+len+1,a[i])-o;
Update(i,1);
}
for (int i=1;i<=m;i++)
{
if (q[i].opt!=2) q[i].k=lower_bound(o+1,o+len+1,q[i].k)-o;
if (q[i].opt==1)
printf("%d
",Sum(q[i].l,q[i].r,1,q[i].k-1)+1);
if (q[i].opt==2)
printf("%d
",Rank(q[i].l,q[i].r,q[i].k));
if (q[i].opt==3)
{
Update(q[i].pos,-1);
a[q[i].pos]=q[i].k;
Update(q[i].pos,1);
}
if (q[i].opt==4)
{
int sum=Sum(q[i].l,q[i].r,1,q[i].k-1);
if (!sum) printf("-2147483647
");
else printf("%d
",Rank(q[i].l,q[i].r,sum));
}
if (q[i].opt==5)
{
int sum=Sum(q[i].l,q[i].r,1,q[i].k);
if (sum==q[i].r-q[i].l+1) printf("2147483647
");
else printf("%d
",Rank(q[i].l,q[i].r,sum+1));
}
}
return 0;
}
[ZJOI2013]K大数查询
#include<cstdio>
#include<algorithm>
using namespace std;
const int N = 50005;
#define ll long long
struct segment_tree{
int ls,rs,tim;ll num;
}t[N*300];
int n,m,rt[N*16],tot;
int gi()
{
int x=0,w=1;char ch=getchar();
while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar();
if (ch=='-') w=0,ch=getchar();
while (ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();
return w?x:-x;
}
void Modify(int &x,int l,int r,int ql,int qr)
{
if (!x) x=++tot;
if (l==ql&&r==qr) {t[x].tim++;return;}
t[x].num+=qr-ql+1;
int mid=l+r>>1;
if (qr<=mid) Modify(t[x].ls,l,mid,ql,qr);
else if (ql>mid) Modify(t[x].rs,mid+1,r,ql,qr);
else Modify(t[x].ls,l,mid,ql,mid),Modify(t[x].rs,mid+1,r,mid+1,qr);
}
ll Query(int x,int l,int r,int ql,int qr)
{
ll res=1ll*t[x].tim*(qr-ql+1);
if (l==ql&&r==qr) return res+t[x].num;
int mid=l+r>>1;
if (qr<=mid) return res+Query(t[x].ls,l,mid,ql,qr);
else if (ql>mid) return res+Query(t[x].rs,mid+1,r,ql,qr);
else return res+Query(t[x].ls,l,mid,ql,mid)+Query(t[x].rs,mid+1,r,mid+1,qr);
}
int main()
{
n=gi();m=gi();
while (m--)
{
int opt=gi(),a=gi(),b=gi(),c=gi(),now=1,l=1,r=n;
if (opt==1)
while (233)
{
Modify(rt[now],1,n,a,b);
if (l==r) break;
int mid=l+r>>1;
if (c<=mid) now=now<<1,r=mid;
else now=now<<1|1,l=mid+1;
}
else
while (l<r)
{
ll sum=Query(rt[now<<1|1],1,n,a,b);
int mid=l+r>>1;
if ((ll)c<=sum)
now=now<<1|1,l=mid+1;
else c-=sum,now=now<<1,r=mid;
}
if (opt==2) printf("%d
",l);
}
return 0;
}
[CTSC2008]网络管理
#include<cstdio>
#include<algorithm>
using namespace std;
int gi()
{
int x=0,w=1;char ch=getchar();
while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar();
if (ch=='-') w=0,ch=getchar();
while (ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();
return w?x:-x;
}
const int N = 8e4+5;
struct segment_tree{int ls,rs,v;}t[N*200];
struct operation{int k,a,b;}q[N];
int n,m,val[N],to[N<<1],nxt[N<<1],head[N],cnt,o[N<<1],len;
int fa[N],dep[N],sz[N],son[N],top[N],dfn[N];
int rt[N],tot,tmp1[N],tmp2[N],t1,t2;
void link(int u,int v){to[++cnt]=v;nxt[cnt]=head[u];head[u]=cnt;}
void dfs1(int u,int f)
{
fa[u]=f;dep[u]=dep[f]+1;sz[u]=1;
for (int e=head[u];e;e=nxt[e])
{
int v=to[e];if (v==f) continue;
dfs1(v,u);
sz[u]+=sz[v];if (sz[v]>sz[son[u]]) son[u]=v;
}
}
void dfs2(int u,int up)
{
top[u]=up;dfn[u]=++cnt;
if (son[u]) dfs2(son[u],up);
for (int e=head[u];e;e=nxt[e])
if (to[e]!=fa[u]&&to[e]!=son[u])
dfs2(to[e],to[e]);
}
int getlca(int u,int v)
{
while (top[u]!=top[v])
{
if (dep[top[u]]<dep[top[v]]) swap(u,v);
u=fa[top[u]];
}
return dep[u]<dep[v]?u:v;
}
void Modify(int &x,int l,int r,int p,int v)
{
if (!x) x=++tot;t[x].v+=v;
if (l==r) return;int mid=l+r>>1;
if (p<=mid) Modify(t[x].ls,l,mid,p,v);
else Modify(t[x].rs,mid+1,r,p,v);
}
int Query(int l,int r,int k)
{
if (l==r) return l;
int mid=l+r>>1,sum=0;
for (int i=1;i<=t1;++i) sum+=t[t[tmp1[i]].rs].v;
for (int i=1;i<=t2;++i) sum-=t[t[tmp2[i]].rs].v;
if (k<=sum)
{
for (int i=1;i<=t1;++i) tmp1[i]=t[tmp1[i]].rs;
for (int i=1;i<=t2;++i) tmp2[i]=t[tmp2[i]].rs;
return Query(mid+1,r,k);
}
else
{
for (int i=1;i<=t1;++i) tmp1[i]=t[tmp1[i]].ls;
for (int i=1;i<=t2;++i) tmp2[i]=t[tmp2[i]].ls;
return Query(l,mid,k-sum);
}
}
void PreModify(int k,int p,int v)
{
for (int i=k;i<=n;i+=i&-i)
Modify(rt[i],1,len,p,v);
}
int PreQuery(int u,int v,int k)
{
t1=t2=0;
for (int i=dfn[u];i;i-=i&-i) tmp1[++t1]=rt[i];
for (int i=dfn[v];i;i-=i&-i) tmp1[++t1]=rt[i];
int lca=getlca(u,v);
for (int i=dfn[lca];i;i-=i&-i) tmp2[++t2]=rt[i];
for (int i=dfn[fa[lca]];i;i-=i&-i) tmp2[++t2]=rt[i];
return Query(1,len,k);
}
int main()
{
n=gi();m=gi();
for (int i=1;i<=n;++i) val[i]=o[++len]=gi();
for (int i=1;i<n;++i)
{
int u=gi(),v=gi();
link(u,v);link(v,u);
}
for (int i=1;i<=m;++i)
{
q[i]=(operation){gi(),gi(),gi()};
if (q[i].k==0) o[++len]=q[i].b;
}
sort(o+1,o+len+1);len=unique(o+1,o+len+1)-o-1;
for (int i=1;i<=n;++i)
val[i]=lower_bound(o+1,o+len+1,val[i])-o;
for (int i=1;i<=m;++i)
if (q[i].k==0) q[i].b=lower_bound(o+1,o+len+1,q[i].b)-o;
dfs1(1,0);cnt=0;dfs2(1,1);
for (int i=1;i<=n;++i)
PreModify(dfn[i],val[i],1),PreModify(dfn[i]+sz[i],val[i],-1);
for (int i=1;i<=m;++i)
{
if (q[i].k==0)
{
PreModify(dfn[q[i].a],val[q[i].a],-1);
PreModify(dfn[q[i].a]+sz[q[i].a],val[q[i].a],1);
val[q[i].a]=q[i].b;
PreModify(dfn[q[i].a],val[q[i].a],1);
PreModify(dfn[q[i].a]+sz[q[i].a],val[q[i].a],-1);
}
else
{
int emm=dep[q[i].a]+dep[q[i].b]-2*dep[getlca(q[i].a,q[i].b)]+1;
if (q[i].k>emm) puts("invalid request!");
else printf("%d
",o[PreQuery(q[i].a,q[i].b,q[i].k)]);
}
}
return 0;
}
[HNOI2016]网络
#include<cstdio>
#include<algorithm>
#include<queue>
using namespace std;
const int MAX=200005;
struct segment_tree
{
priority_queue<int>num,del;
void PUSH(int x,int type)
{
if (!type) num.push(x);
else del.push(x);
}
int TOP()
{
while (!del.empty()&&num.top()==del.top()) num.pop(),del.pop();
if (!num.empty()) return num.top();
return -1;
}
}t[MAX<<2];
struct event{int u,v,val;}sth[MAX];
struct edge{int to,next;}a[MAX<<1];
struct interval{int l,r;}qu[MAX];
int head[MAX],fa[MAX],dep[MAX],sz[MAX],son[MAX],top[MAX],dfn[MAX];
int n,m,cnt;
int gi()
{
int x=0,w=1;char ch=getchar();
while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar();
if (ch=='-') w=-1,ch=getchar();
while (ch>='0'&&ch<='9')
{
x=(x<<3)+(x<<1)+ch-'0';
ch=getchar();
}
return x*w;
}
bool cmp(interval x,interval y)
{
return x.l<y.l;
}
void Link(int u,int v)
{
a[++cnt]=(edge){v,head[u]};
head[u]=cnt;
}
void dfs1(int u,int f)
{
fa[u]=f;dep[u]=dep[f]+1;sz[u]=1;
for (int e=head[u];e;e=a[e].next)
{
int v=a[e].to;
if (v==f) continue;
dfs1(v,u);
sz[u]+=sz[v];
if (sz[v]>sz[son[u]]) son[u]=v;
}
}
void dfs2(int u,int up)
{
top[u]=up;dfn[u]=++cnt;
if (son[u]) dfs2(son[u],up);
for (int e=head[u];e;e=a[e].next)
{
int v=a[e].to;
if (v==fa[u]||v==son[u]) continue;
dfs2(v,v);
}
}
void Modify(int now,int l,int r,int ql,int qr,int val,int type)
{
if (l>=ql&&r<=qr)
{
t[now].PUSH(val,type);
return;
}
int mid=l+r>>1;
if (ql<=mid) Modify(now<<1,l,mid,ql,qr,val,type);
if (qr>mid) Modify(now<<1|1,mid+1,r,ql,qr,val,type);
}
int Query(int now,int l,int r,int pos)
{
if (l==r) return t[now].TOP();
int mid=l+r>>1,res=t[now].TOP();
if (pos<=mid) res=max(res,Query(now<<1,l,mid,pos));
else res=max(res,Query(now<<1|1,mid+1,r,pos));
return res;
}
void Work(int u,int v,int val,int type)
{
cnt=0;
while (top[u]!=top[v])
{
if (dep[top[u]]<dep[top[v]]) swap(u,v);
qu[++cnt]=(interval){dfn[top[u]],dfn[u]};
u=fa[top[u]];
}
if (dep[u]>dep[v]) swap(u,v);
qu[++cnt]=(interval){dfn[u],dfn[v]};
sort(qu+1,qu+cnt+1,cmp);
qu[0].r=0;qu[++cnt].l=n+1;
for (int i=1;i<=cnt;i++) if (qu[i].l-qu[i-1].r>=2) Modify(1,1,n,qu[i-1].r+1,qu[i].l-1,val,type);
}
int main()
{
n=gi();m=gi();
for (int i=1;i<n;i++)
{
int u=gi(),v=gi();
Link(u,v);Link(v,u);
}
dfs1(1,0);cnt=0;dfs2(1,1);
for (int i=1;i<=m;i++)
{
int type=gi();
if (!type)
{
int u=gi(),v=gi(),val=gi();
sth[i]=(event){u,v,val};
Work(u,v,val,type);
}
else if (type==1)
{
int k=gi();
Work(sth[k].u,sth[k].v,sth[k].val,type);
}
else
{
int u=gi();
printf("%d
",Query(1,1,n,dfn[u]));
}
}
return 0;
}