Submission #478833

#	Time	Username	Problem	Language	Result	Execution time	Memory
478833		khoabright	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	575 ms	52820 KiB

tickets

#include <bits/stdc++.h>
using namespace std;
 
//#define int long long 
#define ff first
#define ss second
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define rep(i, a, b) for (int i = (int)a; i <= (int)b; ++i)
#define rep1(i, a, b) for (int i = (int)a; i >= (int)b; --i)
#define mp make_pair
#define vii vector<vector<int>>
#define ll long long 
 
const int N = 2e5 + 5;  
const ll inf = 2e9 + 5;
 
void allocate_tickets(vii a);
// void allocate_tickets(vii a) {
//     int n = a.size(), m = a[0].size();
//     rep(i, 0, n - 1) {
//         rep(j, 0, m - 1) {
//             cout << a[i][j] << ' ';
//         }
//         cout << '\n';
//     }
// }
 
struct ticket{
    int color, value;
};
 
bool operator < (const ticket &x, const ticket &y) {
    return x.value < y.value;
}  
 
ll find_maximum(int k, vii a) {
    function<int()> sub1 = [&]() {
        int n = a.size();
        vector<int> v(n);
        rep(i, 0, n - 1) v[i] = a[i][0];
        sort(all(v));
        int bound = v[n / 2];
        int prize = 0;
        rep(i, 0, n - 1) prize += abs(v[i] - bound);
        rep(i, 0, n - 1) a[i][0] = 0;
        allocate_tickets(a);
        return prize;
    };
 
    function<ll()> sub2 = [&]() {
        int n = a.size(), m = a[0].size();
        vii allo(n, vector<int> (m));
        
        ll prize = 0;
        vector<ticket> Replace(n);
        vector<pair<pii, pii>> mima(n); //{min, max}
 
        rep(i, 0, n - 1) {
            pii maxi = {-1, -1}, mini = {inf, inf};
            rep(j, 0, m - 1) {
                maxi = max(maxi, {a[i][j], j});
                mini = min(mini, {a[i][j], j});
            }
 
            mima[i] = {mini, maxi};
            prize += maxi.ff;
            allo[i][maxi.ss] = 1;
            ticket tmp;
            tmp.color = i, tmp.value = mini.ff + maxi.ff;
            Replace[i] = tmp;
        }
 
        sort(all(Replace));
        
        //cout<<"prize,m="<<prize<<' '<<m<<'\n';
        rep(i, 0, n / 2 - 1) {
            auto [color, value] = Replace[i];
            //cout<<"color,value,mima="<<' '<<color<<' '<<value<<' '<<mima[i].ff.ss<<' '<<mima[i].ss.ss<<'\n';
          allo[color][mima[i].ss.ss] = 0;  
          allo[color][mima[i].ff.ss] = 1;
            
            prize -= value;
        }
 
        rep(i, 0, n - 1) rep(j, 0, m - 1) --allo[i][j];
    
        allocate_tickets(allo);
        return prize;
    };
 
    return sub2();
}

• 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