Submission #116646

#	Time	Username	Problem	Language	Result	Execution time	Memory
116646		roseanne_pcy	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	709 ms	249988 KiB

boxes

#ifdef atom
#include "grader.cpp"
#else
#include "boxes.h"
#endif
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
#define X first
#define Y second
#define vi vector<int>
#define vvi vector< vi >
#define vii vector< ii >
#define mp make_pair
#define pb push_back
const int maxn = 1e7+5;
ll dp1[maxn];
ll dp2[maxn];
int a[maxn];
long long delivery(int n, int k, int l, int p[])
{
    for(int i = 1; i<= n; i++) a[i] = p[i-1];
    for(int i = 1; i<= k; i++) dp1[i] = 2*a[i];
    for(int i = n; i> n-k; i--) dp2[i] = 2*(l-a[i]);
    for(int i = k+1; i<= n; i++) dp1[i] = 2*a[i]+dp1[i-k];
    for(int i = n-k; i>= 1; i--) dp2[i] = 2*(l-a[i])+dp2[i+k];
    ll best = 1e18;
    for(int i = 0; i<= n; i++)
    {
        best = min(best, dp1[i]+dp2[i+1]);
    }
    //printf("%lld\n", best);
    for(int i = 1; i<= n; i++)
    {
        ll left = dp1[i-1];
        ll right = i+k<= n?dp2[i+k]:0;
        best = min(best, left+right+l);
    }
    return best;
}

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