Submission #780324

#	Time	Username	Problem	Language	Result	Execution time	Memory
780324		egekabas	Boxes with souvenirs (IOI15_boxes)	C++14	70 / 100	2066 ms	223052 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(int dist[]){
    vector<ll> dp(n+1);
    
    multiset<ll> minval = {0};
    queue<pll> toerase;
    toerase.push({k-1, 0});

    for(int i = 0; i < n; ++i){
        dp[i+1] = *minval.begin() + 2*dist[i];
        
        minval.insert(dp[i+1]);
        toerase.push({i+k, dp[i+1]});

        while(toerase.size() && toerase.front().ff == i){
            minval.erase(minval.lower_bound(toerase.front().ss));
            toerase.pop();
        }
    }
    return dp;
}


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

    sort(p, p+n);
    vector<ll> leftDp = calcOneSide(p);
    
    reverse(p, p+n);
    for(int i = 0; i < n; ++i){
        p[i] = l-p[i];
    }
    vector<ll> rightDp = calcOneSide(p);
    
    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