Submission #1220604

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220604		Zbyszek99	Triple Jump (JOI19_jumps)	C++20	100 / 100	878 ms	122796 KiB

jumps

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define vi vector<int>
#define vl vector<long long>
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace std;
//mt19937 mt;void random(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll rand(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

struct node_str
{
    ll ans = 0,max_act = -1e18,oper = 0;
    node_str operator+(const node_str& other)
    {
        node_str res;
        res.ans = max(ans,other.ans);
        res.max_act = max(max_act,other.max_act);
        return res;
    }
    void change(ll x)
    {
        ans = max(ans,max_act+x);
        oper = max(x,oper);
    }
};

const int tree_siz = 1024*2048-1;
node_str drzewo[tree_siz+1];

void spych(int v)
{
    drzewo[v*2].change(drzewo[v].oper);
    drzewo[v*2+1].change(drzewo[v].oper);
    drzewo[v].oper = 0;
}

void max_all(ll x)
{
    drzewo[1].oper = max(drzewo[1].oper,x);
    drzewo[1].ans = max(drzewo[1].ans,drzewo[1].max_act+drzewo[1].oper);
}

ll get_ans(int akt, int p1, int p2, int s1, int s2)
{
    if(p2 < s1 || p1 > s2) return -1e18;
    if(p1 >= s1 && p2 <= s2) return drzewo[akt].ans;
    spych(akt);
    return max(get_ans(akt*2,p1,(p1+p2)/2,s1,s2),get_ans(akt*2+1,(p1+p2)/2+1,p2,s1,s2));
}

void set_on(int akt, int l, int r, int poz, ll x)
{
    if(l == r)
    {
        drzewo[akt].ans = x;
        drzewo[akt].max_act = x;
        return;
    }
    spych(akt);
    if((l+r)/2 >= poz) set_on(akt*2,l,(l+r)/2,poz,x);
    else set_on(akt*2+1,(l+r)/2+1,r,poz,x);
    drzewo[akt] = drzewo[akt*2]+drzewo[akt*2+1];
}

ll arr[500003];
vector<pii> queries[500003];
ll ans[500003];
vi active_pairs[500003];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random();
    int n;
    cin >> n;
    rep2(i,1,n) cin >> arr[i];
    vector<pii> pairs;
    stack<int> st;
    rep2(i,1,n)
    {
        while(!st.empty() && arr[st.top()] < arr[i])
        {
            st.pop();
        }
        if(siz(st) != 0)
        {
            pairs.pb({st.top(),i});
        }
        st.push(i);
    }
    while(!st.empty()) st.pop();
    for(int i = n; i >= 1; i--)
    {
        while(!st.empty() && arr[st.top()] < arr[i])
        {
            st.pop();
        }
        if(siz(st) != 0)
        {
            pairs.pb({i,st.top()});
        }
        st.push(i);
    }
    sort(all(pairs));
    int q;
    cin >> q;
    rep(qq,q)
    {
        int l,r;
        cin >> l >> r;
        int p = 0;
        int k = siz(pairs)-1;
        int ans = siz(pairs);
        while(p <= k)
        {
            int mid = (p+k)/2;
            if(pairs[mid].ff >= l)
            {
                ans = mid;
                k = mid-1;
            }
            else
            {
                p = mid+1;
            }
        }
        queries[r].pb({ans,qq});
    }
    rep(i,siz(pairs))
    {
        active_pairs[2*pairs[i].ss - pairs[i].ff].pb(i);
    }
    rep2(i,1,n)
    {
        forall(it,active_pairs[i])
        {
            set_on(1,0,tree_siz/2,it,arr[pairs[it].ff]+arr[pairs[it].ss]);
        }
        max_all(arr[i]);
        forall(it,queries[i])
        {
            ans[it.ss] = get_ans(1,0,tree_siz/2,it.ff,tree_siz/2);
        }
    }
    rep(i,q) cout << ans[i] << "\n";
}

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