#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#define fio ios_base::sync_with_stdio(0);cin.tie(0);
#define ll long long
#define en cin.close();return 0;
#define pb push_back
#define fi first//printf("%lli\n",cur);
#define se second//scanf("%lli",&n);
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 2e5+5;
struct node
{
int prior, val, mx, sz, l, r;
};
vector<node> treap;
vector<pair<int,int> > qu[N];
int nw(int val)
{
treap.pb({rng(),val,val,1,0,0});
return treap.size()-1;
}
void update(int node)
{
if(!node) return;
int l = treap[node].l, r = treap[node].r;
treap[node].mx = max({treap[node].val,treap[l].mx,treap[r].mx});
treap[node].sz = treap[l].sz+treap[r].sz+1;
}
int merg(int t1, int t2)
{
if(!t1||!t2)
return (t1|t2);
if(treap[t1].prior<treap[t2].prior)
{
treap[t1].r=merg(treap[t1].r,t2);
update(t1);
return t1;
}
else
{
treap[t2].l=merg(t1,treap[t2].l);
update(t2);
return t2;
}
}
pair<int,int> splitbysize(int t, int k)
{
if(!t)
return {0,0};
int l = treap[t].l, r = treap[t].r, sz = treap[l].sz;
// cout << t << " : " << l << " " << r << " " << sz << endl;
if(sz>=k)
{
pair<int,int> tt = splitbysize(l,k);
treap[t].l=tt.se;
update(t);
return {tt.fi,t};
}
else
{
pair<int,int> tt = splitbysize(r,k-treap[l].sz-1);
treap[t].r=tt.fi;
update(t);
return {t,tt.se};
}
}
pair<int,int> splitbymax(int t, int val)
{
if(!t)
return {0,0};
int l = treap[t].l, r = treap[t].r;
if(treap[l].mx>val||treap[t].val>val)
{
pair<int,int> tt = splitbymax(l,val);
treap[t].l=tt.se;
update(t);
return {tt.fi,t};
}
else
{
pair<int,int> tt = splitbymax(r,val);
treap[t].r=tt.fi;
update(t);
return {t,tt.se};
}
}
int getkth(int t, int k)
{
if(!t)
return 0;
int l = treap[t].l, r = treap[t].r, sz = treap[l].sz;
// cout << t << " : " << l << " " << r << endl;
// cout << k << " " << sz << endl << endl;
if(sz+1==k)
return treap[t].val;
if(sz>=k)
return getkth(l,k);
return getkth(r,k-sz-1);
}
vector<int> make_op(vector<int> &a)
{
int n = a.size();
vector<int> ret;
int it = 0, it2 = n/2;
while(it<n/2||it2<n)
{
if(it==n/2)
ret.pb(a[it2++]);
else if(it2==n)
ret.pb(a[it++]);
else if(a[it]<a[it2])
ret.pb(a[it++]);
else
ret.pb(a[it2++]);
}
return ret;
}
//void pr(int u)
//{
// if(u==0)
// return;
// pr(treap[u].l);
// cout << treap[u].val << " ";
//// cout << u << " " << treap[u].val << "\n";
// pr(treap[u].r);
//}
int main()
{
fio
// ifstream cin("in.in");
// srand(69696);
treap.pb({0,0,0,0,0,0});
int n, q, r = 1;
cin >> n >> q;
vector<int> a(n), ans(q);
for(auto &x:a)
cin >> x;
for(int qi = 0;qi<q;qi++)
{
int t, x;
cin >> t >> x;
qu[min(t,n/2)].pb({x,qi});
}
for(int i = 0;i<=n/2;i++)
{
if(i==0)
{
for(auto x:qu[i])
ans[x.se]=a[x.fi-1];
a=make_op(a);
r=nw(a[0]);
for(int i = 1;i<n;i++)
r=merg(r,nw(a[i]));
// for(int i = 0;i<n;i++)
// cout << a[i] << " ";en
// pr(r);en
}
else
{
for(auto x:qu[i])
{
ans[x.se]=getkth(r,x.fi);
// auto t = splitbysize(r,x.fi);
// cout << endl;
// pr(t.fi);en
// cout << treap[1].l;en
// cout << t.fi << " " << treap[t.fi].l;en
// cout << treap[treap[t.fi].l].val << " " << t.se;en
// auto t2 = splitbysize(t.fi,x.fi-1);
// ans[x.se]=treap[t2.se].val;
// r=merg(t2.fi,merg(t2.se,t.se));
}
auto t = splitbysize(r,n/2);
// pr(t.fi);cout << endl;
// pr(t.se);en
// auto t4 = splitbysize(t2.fi,treap[t2.fi].sz-1);
// t2.fi=t4.fi;
// t2.se=merg(t4.se,t2.se);
while(treap[t.se].sz>1)
{
int val = getkth(t.se,1);
// cout << val;en
auto t2 = splitbymax(t.se,val);
// auto t4 = splitbysize(t2.fi,treap[t2.fi].sz-1);
// t2.fi=t4.fi;
// t2.se=merg(t4.se,t2.se);
// pr(t2.fi);cout << endl;
// pr(t2.se);en
auto t3 = splitbymax(t.fi,val);
// auto t5 = splitbysize(t3.fi,treap[t3.fi].sz-1);
// t3.fi=t5.fi;
// t3.se=merg(t5.se,t3.se);
t.fi=merg(merg(t3.fi,t2.fi),t3.se);
t.se=t2.se;
// pr(t.fi);cout << endl;
// pr(t.se);cout << endl << endl;
}
r=merg(t.fi,t.se);
}
}
for(auto x:ans)
cout << x << "\n";
// cin.close();
return 0;
}
Compilation message
Main.cpp: In function 'int nw(int)':
Main.cpp:21:18: warning: narrowing conversion of 'rng.std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::operator()()' from 'std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::result_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
21 | treap.pb({rng(),val,val,1,0,0});
| ~~~^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
257 ms |
21836 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
3090 ms |
28588 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
3081 ms |
10424 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
257 ms |
21836 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
