Submission #300424

#	Time	Username	Problem	Language	Result	Execution time	Memory
300424		easrui	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	3077 ms	71976 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define va first
#define vb second
#define all(x) (x).begin(), (x).end()
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<pii,int> ppi;
typedef pair<int,pii> pip;

const int MN = 1505;
const int MOD = 1e9+7;
const int INF = 1e9;

vector<pii> T;
int a[MN],s[MN],cur[MN],D[MN],U[MN];
int n,m;

int cal(int x)
{
    return D[x]+1+m-U[x];
}

bool cmp(int x, int y)
{
    return D[x]<D[y];
}

ll find_maximum(int k, vector<vector<int>> x) {
    n = x.size();
    m = x[0].size();
    ll sum = 0;

    vector<vector<int>> ans;
    vector<int> row(m,-1);
    for(int i=0; i<n; i++){
        ans.push_back(row);
    }

    for(int i=0; i<n; i++)
        for(int j=0; j<m; j++)
            T.emplace_back(x[i][j],i);
    sort(all(T));
    int s=0, e=n*m-1;
    for(int i=0; i<n; i++){
        D[i] = -1;
        U[i] = m;
    }
    while(s<n*k/2){
    	if(cal(T[s].vb)==k) continue;
        D[T[s].vb]++;
        s++;
    }
    while(e>=n*m-n*k/2){
    	if(cal(T[e].vb)==k) continue;
        U[T[e].vb]--;
        e--;
    }
    
    vector<int> v(n);
    for(int i=0; i<k; i++){
        for(int j=0; j<n; j++) v[j] = j;
        sort(all(v),cmp);
        for(int j=0; j<n; j++){
            if(j>=n/2){
                int c = v[j];
                ans[c][D[c]] = i;
                sum -= x[c][D[c]];
                D[c]--;
            }
            else{
                int c = v[j];
                ans[c][U[c]] = i;
                sum += x[c][U[c]];
                U[c]++;
            }
        }
    }

    allocate_tickets(ans);
    return sum;
}

• 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