Submission #305823

#	Time	Username	Problem	Language	Result	Execution time	Memory
305823		4fecta	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	1033 ms	83992 KiB

tickets

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define readl(_s) getline(cin, (_s));
#define boost() cin.tie(0); cin.sync_with_stdio(0)

const int MN = 1505;

int n, m, tot;
vector<int> rnd(1505);

void allocate_tickets(vector<vector<int32_t>> s);

ll find_maximum(int32_t k, vector<vector<int32_t>> a) {
    n = a.size(), m = a[0].size();
    for (int i = 0; i < n; i++) {
        for (int j = m - k; j < m; j++) { //half max, half min, choose all max first then trade for loss.
            tot += a[i][j];
        }
    }
    vector<pii> v;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < k; j++) {
            v.push_back({-a[i][j] - a[i][m - k + j], i}); //we will take the min from this row since it loses the least pts.
        }
    }
    vector<vector<int32_t>> ans(n, vector<int32_t> (m, -1));
    sort(v.begin(), v.end(), greater<>());
    for (int i = 0; i < n * k / 2; i++) tot += v[i].f, rnd[v[i].s]++;
    int id = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < rnd[i]; j++) {
            ans[i][j] = id;
            id++, id %= k;
        }
        int id1 = id;
        for (int j = m - 1; j > m - 1 - (k - rnd[i]); j--) {
            ans[i][j] = id1;
            id1++, id1 %= k;
        }
    }
    allocate_tickets(ans);
    return tot;
}

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