Submission #381183

#	Time	Username	Problem	Language	Result	Execution time	Memory
381183		VodkaInTheJar	Homecoming (BOI18_homecoming)	C++14	13 / 100	1108 ms	262148 KiB

homecoming

#include <bits/stdc++.h>
#include "homecoming.h"

using namespace std;

long long solve(int n, int k, int *a, int *b)
{
	vector <vector <long long> > dp(n+1);
	for (int i = 1; i <= n; i++)
	dp[i].resize(n+1);
	
	for (int i = 1; i <= n; i++)
	{
		dp[i][i-1] = 0;
		for (int j = i; j <= n; j++)
		{
			dp[i][j] = dp[i][j-1];
			if (j - k + 1 < i)
			continue;
			
			long long sum = 0;
			for (int p = j - k + 2; p <= j; p++)
			sum -= b[p-1];
			
			for (int p = j - k + 1; p >= i; p--)
			{
				sum -= b[p-1];
				sum += a[p-1];
				dp[i][j] = max(dp[i][j], sum + dp[i][p-1]);
			}
		}
	}
	
	long long bb = 0;
	for (int i = 1; i <= n; i++)
	{
		bb -= b[i-1];
		bb += a[i-1];
	}
	
	long long ans = max(bb, dp[1][n]); 
	for (int i = 1; i <= n; i++)
	for (int j = i; j <= n; j++)
	{
		long long curr = dp[i][j];
		for (int p = j + 1; p <= n; p++)
		{
			curr -= b[p-1];
			int nxt = p + k - 1;
			if (nxt > n)
			nxt -= n; 
			
			if (nxt >= p || nxt < i)
			curr += a[p-1];
		}
		
		for (int p = 1; p < i; p++)
		{
			curr -= b[p-1];
			if (p + k - 1 < i)
			curr += a[p-1];
		}
		
		ans = max(ans, curr);
	}
	
	return ans;
}

/*
const int maxn = 1e3 + 3; 

int n, k;
int a[maxn], b[maxn];
int main()
{
	cin >> n >> k;
	for (int i = 0; i < n; i++)
	cin >> a[i] >> b[i];
	
	cout << solve(n, k, a, b) << endl; 
}
*/

• Subtask 1: 13 / 13
• Subtask 2: 0 / 18
• Subtask 3: 0 / 31
• Subtask 4: 0 / 38