Submission #79401

#	Time	Username	Problem	Language	Result	Execution time	Memory
79401		Plurm	Boxes with souvenirs (IOI15_boxes)	C++11	100 / 100	1853 ms	360556 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;

long long delivery(int N, int K, int L, int p[]) {
	vector<long long> dp1,dp2;
	vector<vector<long long> > suf;
	dp1.resize(N);
	dp2.resize(N);
	dp1[0] = 2ll*p[0];
	for(int i = 1; i < N; i++){
		dp1[i] = i >= K ? dp1[i-K] : 0ll;
		dp1[i] += 2ll*(long long)p[i];
	}
	dp2[N-1] = 2ll*(long long)(L-p[N-1]);
	for(int i = N-2; i >= 0; i--){
		dp2[i] = i+K >= N ? 0ll : dp2[i+K];
		dp2[i] += 2ll*(long long)(L-p[i]);
	}
	for(int i = 0; i < K; i++){
		suf.push_back(vector<long long>());
		for(int j = 0; K*j+i < N; j++){
			suf[i].push_back(0);
		}
	}
	for(int i = 0; i < K; i++){
		for(int j = (N-i-1)/K; j >= 0; j--){
			suf[i][j] = min((K*(j+1)+i >= N ? (long long)1e18 : suf[i][j+1]),dp2[K*j+i] + (long long)j*(long long)L);
		}
	}
	long long mn = (long long)(N+K-1)/(long long)K*(long long)L;
	for(int i = 0; i < N; i++){
		mn = min(mn,dp1[i] + (long long)(N-i+K-2)/(long long)K*(long long)L);
		mn = min(mn,dp2[i] + (long long)(i+K-1)/(long long)K*(long long)L);
		if(i == N-1) continue;
		mn = min(mn,dp1[i] + suf[(i+1) % K][(i+1) / K] - (long long)(i+1)/(long long)K*(long long)L);
		//for(int j = 0; i+1+j*K < N; j++){
		//	mn = min(mn,dp1[i] + dp2[i+1+j*K] + (long long)(j)*(long long)L);
		//}
	}
	return mn;
}

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