Submission #813274

#	Time	Username	Problem	Language	Result	Execution time	Memory
813274		OrazB	Boxes with souvenirs (IOI15_boxes)	C++14	20 / 100	1 ms	340 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second

const int N = 1e7+5;
ll suff[N], pref[N];

ll F(ll x, int t, ll L){
	ll cur = (t ? (L-x)*2 : x*2);
	return min(L, cur);
}

ll delivery(int n, int K, int L, int p[]){

	for (int i = 0; i < n; i++){
		if (i) pref[i] = pref[i-1];
		if ((i+1)%K == 0) pref[i] += F(p[i], 0, L);
	}

	for (int i = n-1; i >= 0; i--){
		suff[i] = suff[i+1]; 
		if ((n-i)%K == 0) suff[i] += F(p[i], 1, L);
	}
	ll a = suff[0], b = pref[n-1];

	if (n%K){
		a += F(p[0], 1, L);
		b += F(p[n-1], 0, L);
	}

	ll mn = min(a, b);
	for (int i = 0; i < n-1; i++){
		ll x = pref[i];
		if ((i+1)%K) x += F(p[i], 0, L);
		x += suff[i+1];
		if ((n-i-1)%K) x += F(p[i+1], 1, L);
		mn = min(mn, x);
	}
	return mn;
}


// int main ()
// {
// 	ios::sync_with_stdio(false);
// 	cin.tie(0);
// 	int n, k, l;
// 	cin >> n >> k >> l;
// 	int p[n];
// 	for (int i = 0; i < n; i++) cin >> p[i];
// 	cout << delivery(n, k, l, p);
// }

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