Submission #306995

#	Time	Username	Problem	Language	Result	Execution time	Memory
306995		rqi	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	747 ms	51576 KiB

tickets

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

using namespace std;

typedef pair<int, int> pi;
typedef vector<int> vi;
typedef long long ll;
typedef pair<ll, ll> pl;
typedef vector<pl> vpl;

#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define mp make_pair
#define f first
#define s second

long long find_maximum(int k, vector<vi> x) {
	int n = sz(x);
	int m = sz(x[0]);
	vi lo(n, 0);
	vi hi(n, m-1);

	vector<vi> answer;
	for(int i = 0; i < n; i++){
		answer.pb(vi(m, -1));
	}

	ll ans = 0;

	for(int round = 0; round < k; round++){
		vpl sums;	
		for(int i = 0; i < n; i++){
			sums.pb(mp(x[i][lo[i]]+x[i][hi[i]], i));
			ans-=x[i][lo[i]];
		}
		sort(all(sums));
		vi takehi(n, 0);
		for(int i = n/2; i < n; i++){
			ans+=sums[i].f;
			takehi[sums[i].s] = 1;
		}

		for(int i = 0; i < n; i++){
			if(takehi[i] == 0){
				answer[i][lo[i]] = round;
				lo[i]++;
			}
			else{
				answer[i][hi[i]] = round;
				hi[i]--;
			}
		}
	}

	allocate_tickets(answer);
	return ans;
}

• 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