Submission #780308

#	Time	Username	Problem	Language	Result	Execution time	Memory
780308		egekabas	Boxes with souvenirs (IOI15_boxes)	C++14	70 / 100	2084 ms	310404 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define pb push_back
using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pld;
const ll inf = 1e18;

int n, k, l;

vector<ll> calcOneSide(vector<int> &dist){
    vector<ll> dp(n, inf);
    
    set<pll> minval = {{0, k-1}};
    set<pll> toerase = {{k-1, 0}};

    for(int i = 0; i < n; ++i){
        dp[i] = minval.begin()->ff + 2*dist[i];
        
        minval.insert({dp[i], i+k});
        toerase.insert({i+k, dp[i]});

        while(toerase.size() && toerase.begin()->ff == i){
            minval.erase({toerase.begin()->ss, toerase.begin()->ff});
            toerase.erase(toerase.begin());
        }
    }
    dp.insert(dp.begin(), 0LL);
    return dp;
}


long long delivery(int N, int K, int L, int p[]) {
    n = N;
    k = K;
    l = L;

    sort(p, p+n);

    vector<int> dist = vector<int>(n);
    for(int i = 0; i < n; ++i){
        dist[i] = p[i];
    }
    vector<ll> leftDp = calcOneSide(dist);
    
    reverse(all(dist));
    for(auto &u : dist){
        u = l-u;
    }
    vector<ll> rightDp = calcOneSide(dist);
    
    ll ans = inf;
    for(int i = 0; i <= n; ++i){
        ll simpAns = leftDp[i] + rightDp[n-i];
        ll compAns = leftDp[i] + l + rightDp[max(0, n-i-k)];
        ans = min({ans, simpAns, compAns});
    }

    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 30