Submission #304465

#	Time	Username	Problem	Language	Result	Execution time	Memory
304465		urd05	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	1471 ms	92964 KiB

tickets

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

const long long INF=1e18;
int zero[1500];
int one[1500];
typedef pair<long long,int> P;
 
long long find_maximum(int k, vector<vector<int>> v) {
	int n = v.size();
	int m = v[0].size();
	vector<vector<int>> answer(n,vector<int>(m));
	for(int i=0;i<n;i++) {
	    zero[i]=k;
	    one[i]=0;
	    for(int j=0;j<m;j++) {
	        answer[i][j]=-1;
	    }
	}
	priority_queue<P> pq;
	long long ret=0;
	for(int i=0;i<n;i++) {
	    for(int j=0;j<k;j++) {
	        ret-=v[i][j];
	    }
	    for(int j=0;j<k;j++) {
	        pq.push(P(v[i][j]+v[i][m-k+j],i));
	    }
	}
	for(int i=0;i<(n*k)/2;i++) {
	    zero[pq.top().second]--;
	    one[pq.top().second]++;
	    ret+=pq.top().first;
	    pq.pop();
	}
	for(int cnt=0;cnt<k;cnt++) {
	    vector<int> ind;
	    priority_queue<P> pq;
	    int pick=n/2;
	    for(int i=0;i<n;i++) {
	        if (zero[i]==0) {
	            ind.push_back(i);
	            pick--;
	            continue;
	        }
	        if (one[i]==0) {
	            continue;
	        }
	        pq.push(P(one[i]-zero[i],i));
	    }
	    for(int i=0;i<pick;i++) {
	        ind.push_back(pq.top().second);
	        pq.pop();
	    }
	    sort(ind.begin(),ind.end());
	    for(int i=0;i<n;i++) {
	        if (binary_search(ind.begin(),ind.end(),i)) {
	            answer[i][m-one[i]]=cnt;
	            one[i]--;
	        }
	        else {
	            answer[i][zero[i]-1]=cnt;
	            zero[i]--;
	        }
	    }
	}
	allocate_tickets(answer);
	return ret;
}

• 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