Submission #300398

#	Time	Username	Problem	Language	Result	Execution time	Memory
300398		easrui	Carnival Tickets (IOI20_tickets)	C++14	11 / 100	4 ms	768 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 s[x]<s[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){
        D[T[s].vb]++;
        s++;
    }
    while(e>=n*m-n*k/2){
        U[T[e].vb]--;
        e--;
    }
    
    int cnt = 0;
    priority_queue<pip> PQ;

    for(int i=0; i<n; i++){
        PQ.emplace(cal(i),pii{i,cnt});
        cur[i] = cnt++;
    }
    while(PQ.top().va>k){
        int q = PQ.top().vb.va;
        bool flag = 0;
        if(U[q]>=m||D[q]>=0&&T[s].va-x[q][D[q]]<x[q][U[q]]-T[e].va) flag = 1;

        if(flag){
            D[q]--;
            PQ.emplace(cal(q),pii{q,cnt});
            cur[q] = cnt++;
            D[T[s].vb]++;
            PQ.emplace(cal(T[s].vb),pii{T[s].vb,cnt});
            cur[T[s].vb] = cnt++;
            s++;
        }
        else{
            U[q]++;
            PQ.emplace(cal(q),pii{q,cnt});
            cur[q] = cnt++;
            U[T[e].vb]--;
            PQ.emplace(cal(T[e].vb),pii{T[e].vb,cnt});
            cur[T[e].vb] = cnt++;
            e--;
        }
        while(PQ.top().vb.vb!=cur[PQ.top().vb.va]) PQ.pop();
    }

    vector<int> v(n);
    for(int i=0; i<k; i++){
        for(int j=0; j<n; j++) v[j] = D[j];
        sort(all(v));
        for(int j=0; j<n; j++){
            if(D[j]>=v[n/2]){
                ans[j][D[j]] = i;
                sum -= x[j][D[j]];
                D[j]--;
            }
            else{
                ans[j][U[j]] = i;
                sum += x[j][U[j]];
                U[j]++;
            }
        }
    }
    allocate_tickets(ans);
    return sum;
}

Compilation message (stderr)

tickets.cpp: In function 'll find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:69:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   69 |         if(U[q]>=m||D[q]>=0&&T[s].va-x[q][D[q]]<x[q][U[q]]-T[e].va) flag = 1;
      |                            ^

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