/*
Antoni Dlugosz
VLO Krakow
"You know google - they ask you interview questions, well, the kind of question i face on the job is:
"is this bad, is this too much voodoo for our purposes for our mission statement?".
Our mission is to be a modern Commodore64, is this too much voodoo that, this is the op-, this,
there is, this is voodoo, the question is "is this too much?" and that's, this is the hardest question
you could ever face in programming. This right here is the hardest question, right here, right here is the
hardest question in programming, "is this too much voodoo for the next ten centuries?", as f-, for god's officlal temple,
Holy, Holy C is the hardest question in programming, right here, okay, there it is, the hardest question in programming."
~ the late Terry A. Davis
*/
//fast stuff
//#pragma GCC optimize("Ofast")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define mp make_pair
#define eb emplace_back
#define pb push_back
#define e1 first
#define e2 second
#define vt vector
#define size(x) (int32_t)x.size()
#define all(r) begin(r),end(r)
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define time chrono::high_resolution_clock().now().time_since_epoch().count()
#define satori int32_t TCS; cin>>TCS; while(TCS--)
#ifndef DEBUGMODE
#define DEBUGMODE false
#endif
#define debug if(DEBUGMODE)
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int uint;
template<typename T>
using ordset=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
struct reachability_tree{
int n;
struct node{
int sz,fusz,rep,order,mx,trueorder,time_added;
vt<int> sons;
};
vt<node> nodes;
vt<vt<pair<int,int>>> e;
int fnd(int p){
return (nodes[p].rep==p?p:nodes[p].rep=fnd(nodes[p].rep));
}
bool dif(int u,int v){
u=fnd(u);
v=fnd(v);
return (u!=v);
}
void onion(int u,int v){
u=fnd(u);
v=fnd(v);
if(u==v)
return;
if(nodes[u].fusz<nodes[v].fusz)
swap(u,v);
nodes[u].fusz+=nodes[v].fusz;
nodes[v].rep=u;
nodes[u].mx=max(nodes[u].mx,nodes[v].mx);
}
void prep(){
for(int i=0;i<n;i++)
nodes.pb({1,1,i,0,i,0,-1,{}});
for(int i=0;i<n;i++){
for(auto edge:e[i]){
int u=edge.e1;
int v=edge.e2;
if(dif(u,v)){
int par_u=nodes[fnd(u)].mx;
int par_v=nodes[fnd(v)].mx;
int new_par_id=size(nodes);
nodes.pb({0,1,new_par_id,0,new_par_id,0,i,{}});
onion(par_u,new_par_id);
onion(par_v,new_par_id);
nodes[new_par_id].sons.eb(par_u);
nodes[new_par_id].sons.eb(par_v);
cout<<u<<' '<<v<<'\n';
}
}
}
int lorder=-1;
int ltrueorder=-1;
function<void(int)> dfs=[&](int u){
nodes[u].order=n;
if(u<n){
lorder++;
nodes[u].order=lorder;
}
ltrueorder++;
nodes[u].trueorder=ltrueorder;
for(auto v:nodes[u].sons)
dfs(v),nodes[u].sz+=nodes[v].sz,nodes[u].order=min(nodes[u].order,nodes[v].order);
};
dfs(size(nodes)-1);
}
reachability_tree(int N,vt<vt<pair<int,int>>> &E){
n=N;
swap(e,E);
prep();
}
void get_ids(vt<int> &ids){
ids.resize(n);
for(int i=0;i<n;i++)
ids[i]=nodes[i].order;
}
void get_ranges(vt<int> &id,vt<int> &tim,vt<int> &resl,vt<int> &resr){
int q=size(id);
resl.resize(q,0);
resr.resize(q,0);
vt<vt<int>> qrs(n);
for(int i=0;i<q;i++)
qrs[id[i]].eb(i);
vt<int> anc;
function<void(int)> dfs=[&](int u){
anc.eb(u);
if(u<n){
for(auto idd:qrs[u]){
int l=0,r=size(anc)-1;
int bspos=-1;
while(l<=r){
int md=(l+r)/2;
if(nodes[anc[md]].time_added<=tim[idd])
bspos=md,r=md-1;
else
l=md+1;
}
resl[idd]=nodes[anc[bspos]].order;
resr[idd]=nodes[anc[bspos]].sz+resl[idd]-1;
}
}
for(auto v:nodes[u].sons)
dfs(v);
anc.pop_back();
};
dfs(size(nodes)-1);
}
};
struct fenwick_tree{
vt<int> v;
int n;
fenwick_tree(int N=0){
n=N;
v.resize(n+2,0);
}
void add(int pos){
pos++;
for(;pos<=n+1;pos=(pos|(pos-1))+1)
v[pos]++;
}
int leq(int pos){
pos++;
int ans=0;
for(;pos;pos=(pos&(pos-1)))
ans+=v[pos];
return ans;
}
};
struct sweepline_checker{
vt<int> recres;
struct point{
int x,y,recid,sgn;
};
vt<point> points;
fenwick_tree ft;
sweepline_checker(vt<int> &ptx,vt<int> &pty,vt<int> &recxmn,vt<int> &recxmx,vt<int> &recymn,vt<int> &recymx){
recres.resize(size(recxmn),0);
int mx_y_coord=0;
for(int i=0;i<size(ptx);i++)
points.pb({ptx[i],pty[i],-1,0}),mx_y_coord=max(mx_y_coord,pty[i]);
for(int i=0;i<size(recxmn);i++){
points.pb({recxmx[i],recymx[i],i,1});
if(recxmn[i]-1>=0&&recymn[i]-1>=0)
points.pb({recxmn[i]-1,recymn[i]-1,i,1});
if(recymn[i]-1>=0)
points.pb({recxmx[i],recymn[i]-1,i,-1});
if(recxmn[i]-1>=0)
points.pb({recxmn[i]-1,recymx[i],i,-1});
mx_y_coord=max(mx_y_coord,recymx[i]);
}
ft=fenwick_tree(mx_y_coord);
}
static bool cmp(point &a,point &b){
return (a.x==b.x?(a.y==b.y?(a.recid<b.recid):(a.y<b.y)):a.x<b.x);
}
void solve_sweepline(vt<int> &res){
sort(all(points),cmp);
for(auto &pt:points){
if(pt.recid!=-1){
int counted_points=ft.leq(pt.y)*pt.sgn;
recres[pt.recid]+=counted_points;
}
else
ft.add(pt.x);
}
swap(res,recres);
}
};
vt<int> check_validity(int n,vt<int> X,vt<int> Y, vt<int> mxbegin,vt<int> mnbegin,vt<int> mxrange,vt<int> mnrange){
int m=size(X);
int q=size(mxbegin);
vt<vt<pair<int,int>>> mne(n);
vt<vt<pair<int,int>>> mxe(n);
for(int i=0;i<m;i++){
int mn=max(X[i],Y[i]);
int mx=n-min(X[i],Y[i])-1;
mne[mn].pb({X[i],Y[i]});
mxe[mx].pb({X[i],Y[i]});
}
for(int i=0;i<q;i++)
mxrange[i]=n-mxrange[i]-1;
reachability_tree mnt(n,mne);
reachability_tree mxt(n,mxe);
vt<int> mnid,mxid;
mnt.get_ids(mnid);
mxt.get_ids(mxid);
vt<int> qlmn,qrmn,qlmx,qrmx;
mnt.get_ranges(mnbegin,mnrange,qlmn,qrmn);
mxt.get_ranges(mxbegin,mxrange,qlmx,qrmx);
sweepline_checker slc(mnid,mxid,qlmn,qrmn,qlmx,qrmx);
vt<int> res;
slc.solve_sweepline(res);
for(int i=0;i<q;i++)
res[i]=min(res[i],1);
return res;
}
/*
stuff declared locally is not always equal to zero!
pointers on 64-bit environments take up 64 bits, not 32
vectors take up a lot of space
bitsets don't take up a lot of space
going out of bounds is bad
too much voodoo is bad
too much abstraction doesn't really impact performance in c++
abstraction is good
not returning in a non void function is bad
infinite loops are bad
overflow is bad
declaring stuff locally is good
cc_hash_table has faster queries, but considerably slower updates than gp_hash_table
overanalyzing stuff is good
assume nothing works correctly
don't do dumb stuff
speedrun writing slow solutions and generators at the start of the contest
remember to use pragmas :)
*/
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1279 ms |
137480 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
