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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 |
---|---|---|---|---|---|---|---|---|---|
#198177 | #3307. Query on a Tree 17 | phenomena | RE | 0ms | 0kb | C++14 | 4.4kb | 2023-10-03 08:44:52 | 2023-10-03 08:44:52 |
answer
#include<bits/stdc++.h>
using namespace std;
using i64=long long;
#define L(i,l,r) for(int i=(l);i<=(r);++i)
#define R(i,r,l) for(int i=(r);i>=(l);--i)
namespace nqio {
const int mxbf=1<<20;
char ib[mxbf],*p1=ib,*p2=ib,c;
bool s;
struct q {
void r(char&x) {
// return x=getchar(),void();
x=p1==p2&&(p2=(p1=ib)+fread(ib,1,mxbf,stdin),p1==p2)?EOF:*p1++;
} q&operator>>(char&x) {
for(r(x); x<=32; r(x));
return *this;
} q&operator>>(char*x) {
for(r(*x); *x<=32; r(*x));
while(*x>32)r(*++x);
*x=0;
return *this;
} q&operator>>(string&x) {
for(r(c); c<=32; r(c));
x=c,r(c);
while(c>32)x+=c,r(c);
return *this;
} template<typename t>q&operator>>(t&x) {
for(r(c),s=0; !isdigit(c); r(c))s|=c==45;
for(x=0; isdigit(c); r(c))x=x*10+(c^48);
if(s)x=-x;
return *this;
}
} qi;
char ob[mxbf],*pp=ob,*pd=ob+mxbf,stk[64],*tp=stk;
struct p {
void f() {
fwrite(ob,1,pp-ob,stdout),pp=ob;
}~p() {
f();
} void w(char x) {
if(*pp++=x,pp==pd)f();
} p&operator<<(char x) {
w(x);
return *this;
} p&operator<<(char*x) {
while(*x)w(*x++);
return *this;
} p&operator<<(const char*x) {
while(*x)w(*x++);
return *this;
} p&operator<<(string x) {
for(char v:x)w(v);
return *this;
} template<typename t>p&operator<<(t x) {
if(!x)return w(48),*this;
if(x<0)w(45),x=-x;
while(x)*tp++=48|x%10,x/=10;
while(tp!=stk)w(*--tp);
return *this;
}
} qo;
}
using nqio::qi;
using nqio::qo;
namespace yihlaushih {
bool _114;
int n;
const int maxn=3e5+5;
const int maxm=maxn<<1;
int et,lst[maxn],nxt[maxm],ed[maxm];
inline void addedge(int x,int y) {
ed[++et]=y,nxt[et]=lst[x],lst[x]=et;
return ;
}
int fa[maxn][20],sz[maxn],hvy[maxn],dep[maxn];
void dfs(int u) {
L(i,1,__lg(dep[u])) {
fa[u][i]=fa[fa[u][i-1]][i-1];
}
sz[u]=1;
for(int i=lst[u]; i; i=nxt[i]) {
int v=ed[i];
if(v!=fa[u][0]) {
dep[v]=dep[u]+1,fa[v][0]=u,dfs(v);
sz[u]+=sz[v];
if(sz[hvy[u]]<sz[v])hvy[u]=v;
}
}
return ;
}
int cntnid,dfn[maxn],low[maxn],bc[maxn],top[maxn];
void chain(int u, int TOP) {
dfn[u]=++cntnid,bc[cntnid]=u;
top[u]=TOP;
if(hvy[u])chain(hvy[u],TOP);
for(int i=lst[u]; i; i=nxt[i]) {
int v=ed[i];
if(v!=fa[u][0]&&v!=hvy[u]) {
chain(v,v);
}
}
low[u]=cntnid;
return ;
}
#define ls (p<<1)
#define rs (ls|1)
const int maxt=maxn<<3;
i64 sum[maxt],lzy[maxt];
#define pushup(p) (sum[p]=sum[ls]+sum[rs])
#define pushdown(p) (sum[ls]+=(mid-l+1)*lzy[p],lzy[ls]+=lzy[p],sum[rs]+=(r-mid)*lzy[p],lzy[rs]+=lzy[p],lzy[p]=0)
void modify(int p,int l,int r,int ql,int qr,int w) {
if(ql<=l&&r<=qr) {
sum[p]+=1ll*w*(r-l+1);
lzy[p]+=w;
return ;
}
int mid=l+r>>1;
if(lzy[p])pushdown(p);
if(ql<=mid)modify(ls,l,mid,ql,qr,w);
if(mid<qr)modify(rs,mid+1,r,ql,qr,w);
pushup(p);
return ;
}
i64 query(int p, int l, int r, int ql, int qr) {
if(ql<=l&&r<=qr) {
return sum[p];
}
int mid=l+r>>1;
i64 ret=0;
if(lzy[p])pushdown(p);
if(ql<=mid)ret=query(ls,l,mid,ql,qr);
if(mid<qr)ret+=query(rs,mid+1,r,ql,qr);
return ret;
}
int quermid(int p, int l, int r, i64 val) {
if(l==r)return bc[l];
int mid=l+r>>1;
if(lzy[p])pushdown(p);
if(sum[ls]>=val)return quermid(ls,l,mid,val);
return quermid(rs,mid+1,r,val-sum[ls]);
}
#undef ls
#undef rs
bool _514;
int _main(void) {
fprintf(stderr,"floor memory:%.6lf MB\n",(&_114-&_514)/1024./1024.);
// freopen("centroid.in","r",stdin);
// freopen("centroid.out","w",stdout);
int id;
qi>>id>>n;
L(i,1,n-1) {
int u,v;
qi>>u>>v;
addedge(u,v);
addedge(v,u);
}
dfs(1),chain(1,1);
int q;
qi>>q;
while(q--) {
int op;
qi>>op;
if(op==1) {
int u,w=1;
qi>>u;
modify(1,1,n,dfn[u],low[u],w);
} else {
int x,y,w=1;
qi>>x>>y;
while(top[x]!=top[y]) {
if(dep[top[x]]<dep[top[y]])swap(x,y);
modify(1,1,n,dfn[top[x]],dfn[x],w);
x=fa[top[x]][0];
}
if(dep[x]<dep[y])swap(x,y);
modify(1,1,n,dfn[y],dfn[x],w);
}
int u=quermid(1,1,n,sum[1]+1>>1);
for(int i=__lg(n); i>=0; --i) {
if(fa[u][i]&&(query(1,1,n,dfn[fa[u][i]],low[fa[u][i]])<<1)<=sum[1]) {
u=fa[u][i];
}
}
if(fa[u][0]&&(query(1,1,n,dfn[u],low[u])<<1)<=sum[1]) {
u=fa[u][0];
}
qo<<u<<'\n';
}
return 0;
}
}
int main() {
return yihlaushih::_main(),0;
}
详细
Test #1:
score: 0
Runtime Error
input:
7 1 6 1 7 7 3 3 2 7 5 5 4 4 1 2 1 4 1 6 2 6 7