Submission #307121

#	Time	Username	Problem	Language	Result	Execution time	Memory
307121		plekkpea	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	718 ms	52940 KiB

tickets

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

long long find_maximum(int k, vector<vector<int> > x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int> > answer;
	vector<pair<ll,ll> > p;
	for (int i = 0; i < n; i++) {
		vector<int> row(m);
		for (int j = 0; j < m; j++)
            row[j] = -1;
		answer.push_back(row);
	}
	ll l[n+5],r[n+5],y,tul=0,u,su[n+5];
	for(int i=0; i<n; i++){
        l[i]=0;
        r[i]=m-1;
        su[i]=0;
        for(int j=0; j<k; j++) su[i]+=x[i][j];
        for(int j=m-1; j>=m-k; j--) su[i]+=x[i][j];
	}
	for(int o=0; o<k; o++){
        p.resize(0);
        for(int i=0; i<n; i++) p.push_back({su[i],i});
        sort(p.begin(),p.end());
        u=p[n/2].second;
        u=x[u][r[u]];
        for(int i=0; i<n; i++) if(i<n/2){
            y=p[i].second;
            answer[y][l[y]]=o;
            tul+=u-x[y][l[y]];
            su[y]-=x[y][l[y]];
            //su[y]-=x[y][r[y]-k+o];
            l[y]++;
        }
        else{
            y=p[i].second;
            answer[y][r[y]]=o;
            tul+=x[y][r[y]]-u;
            su[y]-=x[y][r[y]];
            //su[y]-=x[y][l[y]+k-o];
            r[y]--;
        }
	}
	allocate_tickets(answer);
	return tul;
}

• 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