Submission #133251

#	Time	Username	Problem	Language	Result	Execution time	Memory
133251		Kewo	Cake 3 (JOI19_cake3)	C++17	5 / 100	23 ms	18808 KiB

cake3

#include <bits/stdc++.h>
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define mid ((x + y) / 2)
#define left (ind * 2)
#define right (ind * 2 + 1)
#define mp make_pair
#define timer ((double)clock() / CLOCKS_PER_SEC)
#define endl "\n"
#define spc " "
#define d1(x) cerr<<#x<<":"<<x<<endl
#define d2(x, y) cerr<<#x<<":"<<x<<" "<<#y<<":"<<y<<endl
#define d3(x, y, z) cerr<<#x<<":"<<x<<" "<<#y<<":"<<y<<" "<<#z<<":"<<z<<endl
#define fast_io() ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;

typedef long long int lli;
typedef pair<lli, lli> ii;
typedef pair<ii, int> iii;
typedef pair<double, double> dd;

const int N = (int)(1e2 + 5);
const int LOG = (int)(20);
const lli inf = (lli)(1e15);

lli n, m, ans = -inf, dp[N][N][N];
ii p[N];

lli f(int x, int y, int z) {
	if(z < 0)
		return -inf;
	if(x == y + 1) {
		if(z == 0)
			return 0;
		else
			return -inf;
	}
	if(dp[x][y][z] != -1)
		return dp[x][y][z];
	return dp[x][y][z] = max(f(x + 1, y, z), f(x + 1, y, z - 1) + p[x].se);
}

int main() {
	fast_io();
	// freopen("inp.in", "r", stdin);

	memset(dp, -1, sizeof dp);
	cin >> n >> m;
	for(int i = 1; i <= n; i++)
		cin >> p[i].se >> p[i].fi;
	sort(p + 1, p + n + 1);
	for(int i = 1; i <= n; i++)
		for(int j = i + m - 1; j <= n; j++)
			ans = max(ans, f(i + 1, j - 1, m - 2) + p[i].se + p[j].se - 2 * (p[j].fi - p[i].fi));
	cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 19
• Subtask 3: 0 / 76