Submission #300675

#	Time	Username	Problem	Language	Result	Execution time	Memory
300675		errorgorn	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	1217 ms	90744 KiB

tickets

#include "tickets.h"

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

#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second

#define rep(x,s,e) for (auto x=(s)-((s)>(e));x!=(e)-((s)>(e));((s)<(e)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()

const ll INF=1e18;

int n,m,k;
vector<vector<int> > arr;
vector<vector<int> > state;
vector<vector<int> > ans;

vector<int> white[1505];
vector<int> black[1505];
bool vis[1505];

int pos[1505];
priority_queue<ii> pq;

long long find_maximum(int _k, std::vector<std::vector<int>> _arr) {
	n=sz(_arr),m=sz(_arr[0]),arr=_arr;
	k=_k;
	
	rep(x,0,n){
		ans.push_back(vector<int>());
		rep(y,0,m) ans[x].push_back(-1);
		
		state.push_back(vector<int>());
		rep(y,0,m) state[x].push_back(-1);
		
		pos[x]=k-1;
		pq.push(ii(arr[x][pos[x]+m-k]+arr[x][pos[x]],x));
	}
	
	int node;
	rep(zzz,0,n*k/2){
		node=pq.top().se,pq.pop();
		
		state[node][pos[node]+m-k]=1;
		pos[node]--;
		if (pos[node]==-1) continue;
		pq.push(ii(arr[node][pos[node]+m-k]+arr[node][pos[node]],node));
	}
	
	rep(x,0,n){
		rep(y,0,pos[x]+1) state[x][y]=0;
	}
	
	ll res=0;
	rep(x,0,n){
		rep(y,0,m){
			//cout<<state[x][y]<<" ";
			if (state[x][y]==0){
				res-=arr[x][y];
				white[x].push_back(y);
			}
			else if (state[x][y]==1){
				res+=arr[x][y];
				black[x].push_back(y);
			}
		}
		//cout<<endl;
	}
	
	rep(idx,0,k){
		memset(vis,false,sizeof(vis));
		int currw=0;
		
		rep(x,0,n){
			if (white[x].empty()){
				vis[x]=true;
				ans[x][black[x].back()]=idx;
				black[x].pop_back();
			}
			else if (black[x].empty()){
				vis[x]=true;
				ans[x][white[x].back()]=idx;
				white[x].pop_back();
				currw++;
			}
		}
		
		rep(x,0,n) if (!vis[x]){
			if (currw==n/2){
				ans[x][black[x].back()]=idx;
				black[x].pop_back();
			}
			else {
				ans[x][white[x].back()]=idx;
				white[x].pop_back();
				currw++;
			}
		}
	}
	
	allocate_tickets(ans);
	
	return res;
}

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