이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "sequence.h"
#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,apio=b;i<apio;i++)
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) for(auto slkdh:v)cout<<slkdh<<" ";cout<<"\n"
using namespace std;
typedef int ll;
typedef pair<ll,ll> ii;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
const ll INF=5e6;
struct node{
ll mxp,mnp,mxs,mns,sum;
};
node oper(node a, node b){
a.mxp=max(a.mxp,a.sum+b.mxp);
a.mnp=min(a.mnp,a.sum+b.mnp);
a.mxs=max(a.mxs+b.sum,b.mxs);
a.mns=min(a.mns+b.sum,b.mns);
a.sum+=b.sum;
return a;
}
node NEUT({-INF,INF,-INF,INF,0});
struct STcustom{
vector<node>t; ll n;
STcustom(ll n):t(2*n+5,node({0,0,0,0,0})),n(n){}
void upd(ll p, ll v){
p+=n;
t[p].mxp+=v,t[p].mnp+=v,t[p].mxs+=v,t[p].mns+=v,t[p].sum+=v;
for(;p>1;p>>=1)p^=p&1,t[p>>1]=oper(t[p],t[p^1]);
}
node query(ll l, ll r){
node izq=NEUT,der=NEUT;
for(l+=n,r+=n;l<r;l>>=1,r>>=1){
if(l&1)izq=oper(izq,t[l++]);
if(r&1)der=oper(t[--r],der);
}
return oper(izq,der);
}
};
const ll MAXN=5e5+5;
ll n;
ll a[MAXN];
vector<ll>pos[MAXN];
vector<node> pre[MAXN],suf[MAXN];
bool can(ll x){
fore(i,0,n){
fore(s,0,SZ(pos[i])){
ll e=s+x-1;
if(e>=SZ(pos[i]))break;
ll dif=pre[i][e].sum-pre[i][s].sum;
if(dif<=0){
if(dif+pre[i][s].mxs+suf[i][e].mxp+e-s+1>=0)return 1;
}
else {
if(dif+pre[i][s].mns+suf[i][e].mnp-(e-s+1)<=0)return 1;
}
}
}
return 0;
}
int sequence(int N, std::vector<int> A) {
n=N;
fore(i,0,n)a[i]=A[i]-1;
fore(i,0,n)pos[a[i]].pb(i);
STcustom st(n);
fore(i,0,n)st.upd(i,1);
fore(i,0,n){
for(auto j:pos[i])st.upd(j,-1);
pre[i].resize(SZ(pos[i]));
suf[i].resize(SZ(pos[i]));
fore(j,0,SZ(pos[i])){
pre[i][j]=st.query(0,pos[i][j]+1);
suf[i][j]=st.query(pos[i][j],n);
}
for(auto j:pos[i])st.upd(j,-1);
}
ll l=1,r=n+5;
while(l<=r){
ll m=(l+r)/2;
if(can(m))l=m+1;
else r=m-1;
}
return r;
}
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