Submission #808274

#	Time	Username	Problem	Language	Result	Execution time	Memory
808274		drdilyor	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	420 ms	73148 KiB

tickets

#include<bits/stdc++.h>
#include "tickets.h"
using namespace std;
using ll = long long;
const int inf = 1e9;

#define debug(args...) cout << "[" << #args << "]: "; debug_out(args...);
void debug_out() {
    cout << endl;
}
template<typename H, typename... T>
void debug_out(H h, T... t) {
    cout << h << ", ";
    debug_out(t...);
}

long long find_maximum_4(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
    assert(m == k);

    vector<tuple<int,int,int>> big;
    big.reserve(n * m);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m;j++)
            big.push_back({x[i][j], i, j});
    }

    stable_sort(big.begin(), big.end());

    vector low(n, vector<int>(m, 0));
    for (int i = 0; i < n * m / 2; i++) {
        low[get<1>(big[i])][get<2>(big[i])] = 1;
    }

    ll sum = 0;
    vector ans(n, vector<int>(m, 0));
    int round_low = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (low[i][j]) {
                sum -= x[i][j];
                ans[i][j] = round_low++;
                if (round_low >= m) round_low -= m;
            }
        }
        int round = round_low;
        for (int j = 0; j < m; j++) {
            if (!low[i][j]) {
                sum += x[i][j];
                ans[i][j] = round++;
                if (round >= m) round -= m;
            }
        }
    }
    allocate_tickets(ans);

	return sum;
}

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
    vector<tuple<int,int,int>> pos(n);
    for (int i = 0; i < n; i++)
        pos[i] = {-x[i][0], x[i][m-1], i};

    sort(pos.begin(), pos.end(), [&](auto a, auto b) {
            return get<1>(a) - get<0>(a) > get<1>(b) - get<0>(b);
    });

    vector ans(n, vector(m, -1));
    ll sum = 0;
    for (int i = 0; i < n; i++) {
        int j = get<2>(pos[i]);
        if (i >= n / 2) {
            sum -= x[j][0];
            ans[j][0] = 0;
        }
        else {
            sum += x[j][m-1];
            ans[j][m-1] = 0;
        }
    }
    allocate_tickets(ans);
    return sum;
}

• 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