Submission #623258

#	Time	Username	Problem	Language	Result	Execution time	Memory
623258		1bin	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	1945 ms	2097152 KiB

tickets

#include <tickets.h>
#include <bits/stdc++.h>
#include <cassert>

using namespace std;

#define all(v) v.begin(), v.end()
typedef long long ll;
const int NMAX = 2e3 + 5;

ll find_maximum(int k, vector<vector<int>> x){
    int n = x.size();
    int m = x[0].size();
    vector<vector<int>> s(n, vector<int> (m, -1));
    vector<pair<ll, int>> v;
    vector<int> cnt(n);
    ll ans = 0;
    for(int i = 0; i < n; i++)
        for(int j = k - 1, l = m - 1; j >= 0; j--, l--){
            ans -= x[i][j];
            v.emplace_back(x[i][j] + x[i][l], i);
        }
    
    sort(all(v));
    for(int i = n * k / 2; i < n * k; i++){
        auto& [t, y] = v[i];
        ans += t; cnt[y]++;
    }
    priority_queue<pair<int, int>> mn, mx;
    for(int i = 0; i < n; i++) {
        mn.emplace(k - 1 - cnt[i], i);
        mx.emplace(-(m - cnt[i]), i);
    }
    
    for(int i = 0; i < k; i++){
        vector<pair<int, int>> tmn, tmx;
        vector<int> chk(n);
        for(int j = 0; j < n / 2; j++){
            auto[t, y] = mn.top(); mn.pop();
            assert(t >= 0);
            s[y][t] = i; chk[y] = 1;
            tmn.emplace_back(--t, y);
        }
        for(int j = 0; j < n / 2; j++){
            auto[t, y] = mx.top(); mx.pop(); t = -t;
            if(chk[y]) {
                j--; tmn.emplace_back(-t, y); continue;
            }
            s[y][t] = i;
            t++;
            tmn.emplace_back(-t, y);
        }
        for(auto p : tmn) mn.emplace(p);
        for(auto p : tmx) mx.emplace(p);
    }
    allocate_tickets(s);
    return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'll find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:26:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   26 |         auto& [t, y] = v[i];
      |               ^
tickets.cpp:39:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   39 |             auto[t, y] = mn.top(); mn.pop();
      |                 ^
tickets.cpp:45:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   45 |             auto[t, y] = mx.top(); mx.pop(); t = -t;
      |                 ^

• 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