이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const int N = 5e5 + 23;
const ll inf = 1e18;
#define F first
#define S second
#define pb push_back
#define sz(x) ((int)x.size())
#define kill(x) cout<<x , exit(0);
#define all(x) x.begin(),x.end()
#define lc (v<<1)
#define rc ((v<<1)|1)
#define debug(x) cerr<< #x << " : " << x << '\n';
#define int unsigned int
struct Seg {
int t[N<<2];
Seg() {
fill(t,t+(N<<2),0);
}
void clear() {
fill(t,t+(N<<2),0);
}
void upd(int pos,int x,int v=1,int tl=1,int tr= N) {
if(tr-tl==1) {
t[v] = max(t[v],x);
return;
}
int mid=(tl+tr)/2;
if(pos<mid)
upd(pos,x,lc,tl,mid);
else
upd(pos,x,rc,mid,tr);
t[v] = max(t[lc],t[rc]);
}
int get(int l,int r,int v=1,int tl=1,int tr= N) {
if(l > r) return 0;
if(l == tl && r == tr-1) return t[v];
int mid=(tl + tr)/2;
return max(get(l,min(mid-1,r),lc,tl,mid) , get(max(l,mid),r,rc,mid,tr));
}
}seg,mx;
int n,q;
int a[N];
vector<pair<int,int>> Q[N];
vector<pair<int,int>> here[N];
int ans[N];
vector<int> st;
vector<pair<int,int> > edges;
int32_t main() {
cin>>n;
for(int i = 1; i<= n ; i ++) {
cin>>a[i];
mx.upd(i,a[i]);
}
cin>>q;
st.pb(0);
for(int i = 1; i<= n ; i++) {
while(st.back() && a[st.back()] < a[i]) st.pop_back();
if(sz(st) > 1) {
edges.pb({st.back(),i});
if(sz(st) > 2) {
edges.pb({ st[sz(st)-2],i});
}
}
st.pb(i);
} st.clear();
st.pb(0);
for(int i = n ; i >= 1;i --) {
while(st.back() && a[st.back()] < a[i]) st.pop_back();
if(sz(st) > 1) {
edges.pb({i,st.back()});
if(sz(st) > 2) {
edges.pb({i,st[sz(st)-2]});
}
}
st.pb(i);
}
for(int i = 1; i< n ; i++) {
edges.pb({i,n});
}
for(int i = 2; i<= n ; i++) {
edges.pb({1,i});
}
for(auto [l,r] : edges) {
here[l].pb({r,a[l] + a[r] + mx.get(l+1,(l+r)/2)});
}
for(int i = 0; i < q; i ++) {
int l,r; cin>>l>>r;
Q[l].pb({r,i});
}
for(int i = n; i>= 1;i --) {
for(auto [r,val] : here[i]) {
seg.upd(r,val);
}
for(auto [r,id] : Q[i]) ans[id] = seg.get(i,r);
}
for(int i = 0 ; i< q; i ++) {
cout<<ans[i] << '\n';
}
return 0;
}
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