Submission #831454

#	Time	Username	Problem	Language	Result	Execution time	Memory
831454		qin	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	696 ms	426504 KiB

boxes

#include <bits/stdc++.h>
#include <boxes.h>
using namespace std;
typedef long long ll;
struct st{
		ll w; int i;
		st(){}
		st(ll W, int I) : w(W), i(I) {}
};
ll delivery(int n, int k, int l, int p[]){
		vector<int> t(n), d1(n+1), d2(n+1);
		for(int i = 0; i < n; ++i) t[i] = p[i];
		d1[0] = t[0], d2[n] = l-t[n-1];
		for(int i = 1; i < n; ++i) d1[i] = t[i]-t[i-1];
		for(int i = n-1; i; --i) d2[i] = d1[i] + d2[i+1];
		for(int i = 1; i < n; ++i) d1[i] += d1[i-1];
		for(int i = 0; i < n; ++i) d2[i] = d2[i+1];
		vector<ll> dp1(n), dp2(n);
		deque<st> dq; dq.emplace_back(0, -1);
		for(int i = 0; i < n; ++i){
				if(!dq.empty() && i-dq.front().i > k) dq.pop_front();
				dp1[i] = dq.front().w+ll(d1[i]+min(d1[i], l-d1[i]));
				while(!dq.empty() && dq.back().w >= dp1[i]) dq.pop_back();
				dq.emplace_back(dp1[i], i);
		} while(!dq.empty()) dq.pop_back();
		dq.emplace_back(0, n);
		for(int i = n-1; ~i; --i){
				if(!dq.empty() && dq.front().i-i > k) dq.pop_front();
				dp2[i] = dq.front().w+ll(d2[i]+min(d2[i], l-d2[i]));
				while(!dq.empty() && dq.back().w >= dp2[i]) dq.pop_back();
				dq.emplace_back(dp2[i], i);
		} ll wynik = min(dp1[n-1], dp2[0]);
		for(int i = 0; i < n-1; ++i) wynik = min(wynik, dp1[i]+dp2[i+1]);
		return wynik;
}

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