Submission #1059165

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059165		Lalic	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	347 ms	103580 KiB

tickets

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

#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define allr(x) x.rbegin(), x.rend()
#define mp make_pair

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef complex<double> cd;

ll find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int>> ans(n, vector<int>(m, -1));
	
	vector<vector<ll>> dp(n, vector<ll>(k*(n/2)+1, -1e17)), ps(n, vector<ll>(m));
	vector<vector<pii>> prev(n, vector<pii>(k*(n/2)+1));
	
	for(int i=0;i<n;i++){
		ps[i][0]=x[i][0];
		for(int j=1;j<m;j++) ps[i][j]=ps[i][j-1]+x[i][j];
	}
	
	for(int i=0;i<=k;i++)
		dp[0][i]=(ps[0][m-1]-(m-k+i-1>=0 ? ps[0][m-k+i-1] : 0))-(i ? ps[0][i-1] : 0), prev[0][i]={-1, 0};	
	
	for(int i=1;i<n;i++){
		for(int j=k*(n/2);j>=0;j--){
			for(int tot=0;tot<=k && j-tot>=0;tot++){
				if(dp[i][j]<dp[i-1][j-tot]+(ps[i][m-1]-(m-k+tot-1>=0 ? ps[i][m-k+tot-1] : 0))-(tot ? ps[i][tot-1] : 0)){
					dp[i][j]=dp[i-1][j-tot]+(ps[i][m-1]-(m-k+tot-1>=0 ? ps[i][m-k+tot-1] : 0))-(tot ? ps[i][tot-1] : 0);
					prev[i][j]={i-1, j-tot};
				}
			}
		}
	}
	
	pii curr={n-1, k*(n/2)};
	vector<int> tot(n);
	while(curr.fi!=-1){
		pii ant=prev[curr.fi][curr.se];
		
		int diff=curr.se-ant.se;
		tot[curr.fi]=diff;
		
		curr=ant;
	}
	
	vector<int> low(n, 0), high(n, m-1);
	for(int i=0;i<k;i++){
		int cnt=0;
		for(int j=0;j<n;j++){
			if(cnt<n/2 && tot[j]){
				ans[j][low[j]]=i;
				low[j]++;
				cnt++;
				tot[j]--;
			}
			else{
				ans[j][high[j]]=i;
				high[j]--;
			}
		}
	}
	allocate_tickets(ans);
	
	return dp[n-1][k*(n/2)];
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10