Submission #441110

#	Time	Username	Problem	Language	Result	Execution time	Memory
441110		roseanne_pcy	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	939 ms	54440 KiB

tickets

#include "tickets.h"
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
 
#include <bits/stdc++.h>
 
using namespace std;
 
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef long long ll;
 
#define f first
#define s second
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rsz resize
 
const int md = 1e9+7;
const ll inf = 1e18;
const int maxn = 2e3+5;
 
template<class T> void ckmin(T &a, T b) { a = min(a, b); }
template<class T> void ckmax(T &a, T b) { a = max(a, b); }
 
int zeros[maxn], ones[maxn];
int p0[maxn], p1[maxn];
int n, m;
 
bool cmp(int x, int y)
{
	return zeros[x]> zeros[y];
}
 
long long find_maximum(int k, vector< vector<int> > b) 
{
	n = b.size(); m = b[0].size();
	vector<int> allnums;
	for(int i = 0; i< n; i++)
	{
		for(int j = 0; j< m; j++)
		{
			allnums.pb(b[i][j]);
		}
	}
	sort(all(allnums));

	int mid = allnums[(n*m)/2];

	ll test = 0;

	for(int i = 0; i< (n*m)/2; i++) test -= allnums[i];
	for(int i = (n*m)/2; i< n*m; i++) test += allnums[i];

	for(int i = 0; i< n; i++)
	{
		for(int j = 0; j< m; j++)
		{
			zeros[i] += (b[i][j] < mid);
			ones[i] += (b[i][j] >= mid);
		}
		p1[i] = zeros[i];
	}
 
	vector< vector<int> > res(n, vector<int>(m, -1));
 
	vector<int> all_nums;
	for(int i = 0; i< n; i++) all_nums.pb(i);
	
	ll sum = 0;
 
	for(int r = 0; r< k; r++)
	{
		sort(all(all_nums), cmp);
		ll minus = 0, plus = 0;
		for(int i = 0; i< n/2; i++)
		{
			int x = all_nums[i];
			if(zeros[x]> 0)
			{
				zeros[x]--;
				minus += b[x][p0[x]];
				res[x][p0[x]++] = r;
			}
			else
			{
				ones[x]--;
				minus += b[x][p1[x]];
				res[x][p1[x]++] = r;
			}
		}
		for(int i = n/2; i< n; i++)
		{
			int x = all_nums[i];
			if(ones[x]> 0)
			{
				ones[x]--;
				plus += b[x][p1[x]];
				res[x][p1[x]++] = r;
			}
			else
			{
				zeros[x]--;
				plus += b[x][p0[x]];
				res[x][p0[x]++] = r;
			}
		}
		sum += plus-minus;
	}
	allocate_tickets(res);
	return test;
}

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