Submission #1074294

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074294		TB_	Meetings (IOI18_meetings)	C++17	17 / 100	126 ms	22732 KiB

meetings

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define fo(i, n) for(ll i = 0; i<(n); i++)
#define pb push_back
#define F first
#define S second
#define deb(x) cout << #x << " = " << (x) << endl 
#define deb2(x, y) cout << #x << " = " << (x)  << ", " << #y << " = " << (y) << endl 
typedef vector<ll> vl;
typedef vector<vl> vvl;

vl v;
ll sufix = 0;

struct Node{
    Node *lnode, *rnode;
    ll l, r, val = 0, pref = 0, suf = 0;
    bool cover = 0;
    Node(ll l, ll r) : l(l), r(r){
        if(r-l==1) val=pref=suf=cover=v[l]; 
        else{
            ll mid =(r+l) / 2;
            lnode = new Node(l, mid);
            rnode = new Node(mid, r);
            val = max(lnode->val, rnode->val);
            val = max(val, lnode->suf+rnode->pref);
            pref = lnode->pref;
            suf = rnode->suf;
            cover=lnode->cover&rnode->cover;
            if(lnode->cover)pref+=rnode->pref;
            if(rnode->cover)suf+=lnode->suf;
        }
    }

    ll query(ll lo, ll hi){
        if(r <= lo || hi <= l) return 0;
        if(r <= hi && lo <= l){
            // deb2(l, r);
            ll ans = max(val, sufix+pref);
            if(cover)sufix+=suf;
            else sufix = suf;
            return ans;
        }
        return max(rnode->query(lo, hi), lnode->query(lo, hi));
    }
};

vector<long long> minimum_costs(vector<int> H, vector<int> L, vector<int> R) {
    int q = L.size();
    ll n = H.size();
    vl C;

    fo(i, n) v.pb(H[i] == 1);
    Node st(0, n+1);
    fo(i, q){
        sufix = 0;
        // deb(i);
        // deb(st.query(L[i], R[i]+1));
        C.pb((R[i]-L[i]+1)*2-st.query(L[i], R[i]+1));
    }




    // if(n>3000||q>10){

    // }else{
    //     fo(ind, q){
    //         ll best = 1e18;
    //         for(ll meet = L[ind]; meet<=R[ind]; meet++){
    //             ll hi = H[meet];
    //             ll current = -hi;
    //             for(ll i = meet; i>=L[ind]; i--){
    //                 hi = max(hi, (ll)H[i]);
    //                 current+=hi;
    //             }
    //             hi = H[meet];
    //             for(ll i = meet; i<=R[ind]; i++){
    //                 hi = max(hi, (ll)H[i]);
    //                 current+=hi;
    //             }
    //             best=min(best, current);
    //             // deb2(current, meet);
    //         }
    //         C.pb(best);
    //     }

    // }
    // fo(i, q) deb(C[i]);
    return C;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 17 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40