Submission #908528

#	Time	Username	Problem	Language	Result	Execution time	Memory
908528		arashMLG	Triple Jump (JOI19_jumps)	C++17	100 / 100	1154 ms	145384 KiB

jumps

#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               	ll

struct Seg {
	int t[N<<2];
	int mx[N<<2];
	int lz[N<<2];
	
	Seg() {
		for(int i = 0 ; i<(N<<2); i ++) t[i] = mx[i] = lz[i] = 0;
	}
	
	void shift(int v) {
		if(lz[v] == 0) return;
		lz[lc] = max(lz[lc],lz[v]);
		lz[rc] = max(lz[rc],lz[v]);
		t[lc] = max(t[lc],mx[lc] + lz[lc]);
		t[rc] = max(t[rc],mx[rc] + lz[rc]);
		lz[v] = 0;
	}
	
	// khode a[i] ha
	void set(int pos,int x,int v=1,int tl= 1,int tr= N) {
		if(tr-tl == 1) {
			mx[v] = x;
			return;
		}
		int mid=(tl+tr)/2;
		if(pos < mid)
			set(pos,x,lc,tl,mid);
		else
			set(pos,x,rc,mid,tr);
		mx[v] = max(mx[lc],mx[rc]);
	}
	
	void add(int l,int r,int x,int v=1,int tl = 1,int tr= N) {
		if(l > r) return;
		if(l == tl && r ==tr-1) {
			lz[v] = max(lz[v],x);
			t[v] = max(t[v],mx[v] + lz[v]);
			return;
		}
		shift(v);
		int mid=(tl+tr)/2;
		add(l,min(mid-1,r),x,lc,tl,mid);
		add(max(l,mid),r,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];
		shift(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;

int n,q;
int a[N];
vector<pair<int,int>> Q[N];
vector<pair<int,int>> here[N];
int ans[N];
vector<int> st;
int L[N],R[N];
vector<pair<int,int> > edges;
int Mx[N];

int32_t main() {
	cin.tie(nullptr)->sync_with_stdio(false);
	cin>>n;
	for(int i = 1; i<= n ; i ++) {
		cin>>a[i];
		seg.set(i,a[i]);
	}
	cin>>q;
	for(int i = 0 ; i< q; i ++) {
		int l,r; cin>>l>>r;
		Q[l].pb({r,i});	
	}
	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) {
			L[i] = st.back();
		}
		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) {
			R[i]=  st.back();
		}
		st.pb(i);
	}
	for(int i= 1; i <= n ; i ++) {
		if(R[i] != 0 && R[i] - i + R[i] <= n) {
			//Mx[R[i]-i+R[i]] = max(Mx[R[i]-i +R[i]], a[i] + a[R[i]]);
			here[i].pb({R[i]-i+R[i],a[i] + a[R[i]]});
		}
		if(L[i] != 0 && i-L[i] + i <= n) {
			//Mx[i-L[i]+i] = max(Mx[i-L[i]+i],a[i] + a[L[i]]);
			here[L[i]].pb({i-L[i]+i,a[i] + a[L[i]]});
		}
	}
	for(int i = n; i >= 1; i --) {
		for(auto [l,val] : here[i]) seg.add(l,n,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;
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 54 / 54