Submission #727692

#	Time	Username	Problem	Language	Result	Execution time	Memory
727692		hoainiem	Boxes with souvenirs (IOI15_boxes)	C++14	35 / 100	1 ms	340 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#define nmax 10000008
const long long inf = 1e18;
using namespace std;
int n, k, l, pl, pr, pmid, a[nmax];
long long ans, f[nmax];
struct container{
    long long cur, sz, sum[nmax];
    void insert(int x){
        sz++;
        cur--;
        if (cur < 0)
            cur += k;
        sum[cur] += x;
    }
    void erase(int x){
        sum[cur] -= x;
        cur++;
        if (cur >= k)
            cur -= k;
        sz--;
    }
    long long cost(){
        return sum[cur] * 2;
    }
}u, v;
vector<int>vtu, vtv;
stack<int>s;
long long calc(long long num){
    return (num % k == 0) ? (num / k * l) : ((num / k + 1) * l);
}
long long delivery(int N, int K, int L, int p[]) {
    ans = inf;
    n = N;
    k = K;
    l = L;
    if (l % 2 == 0)
        pmid = l / 2;
    else
        pmid = -1;
    f[n + 1] = 0;
    for (int i = n; i > 0; i--)
        a[i] = p[i - 1];
    a[0] = 0;
    for (int i = n; i >= 0; i--){
        if (a[i] < l - a[i])
            f[i] = inf;
        else{
            v.insert(l - a[i]);
            f[i] = v.cost();
        }
    }
    for (int i = 0, j = 0; i <= n; i++){
        if (i)
            u.insert(a[i]);
        if (f[i + 1] != inf){
            ans = min(ans, u.cost() + f[i + 1]);
            break;
        }
        if (a[i] > l - a[i])
            break;
        while (j <= n && (a[j] < l - a[j] || (j <= n && a[j] * 2 < a[i] * 2 + l)))
            j++;
        if (j > n)
            ans = min(ans, u.cost() + calc(j - i - 1));
        else{
            int r = j - i - 1;
            if (r % k != 0)
                r = k * (r / k + 1);
            if (i + r >= n)
                ans = min(ans, u.cost() + calc(n - i));
            else{
                ans = min(ans, u.cost() + calc(r) + f[i + r + 1]);
            }
        }
    }
    return ans;
}

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