Submission #989702

#	Time	Username	Problem	Language	Result	Execution time	Memory
989702		steveonalex	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	512 ms	100636 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }
 
// void allocate_tickets(vector<vector<int>> answer){
//     for(int i = 0; i<answer.size(); ++i) printArr(answer[i]);
// }
 
ll find_maximum(int k, vector<vector<int>> x) {
    int n = x.size();
    int m = x[0].size();

    ll ans = 0;
    for(int i = 0; i<n; ++i)
        for(int j = 0; j < k; ++j) 
            ans -= x[i][j];


    vector<vector<int>> sigma(n);
    for(int i = 0; i<n; ++i){
        for(int j = 0; j < k; ++j){
            sigma[i].push_back(x[i][j] + x[i][j + (m - k)]);
        }
    }

    priority_queue<pair<int, int>> pq;
    for(int i= 0; i<n; ++i) pq.push({sigma[i].back(), i});
    for(int iteration = 0; iteration < n * k / 2; ++iteration){
        pair<int, int> u = pq.top(); pq.pop();
        ans += u.first;
        sigma[u.second].pop_back();
        if (sigma[u.second].size()){
            pq.push({sigma[u.second].back(), u.second});
        }
    }




    vector<vector<int>> answer(n, vector<int>(m, -1));
    vector<vector<int>> nigga(n), possa(n);
    for(int i = 0; i<n; ++i){
        int l = sigma[i].size(), r = k - l;
        for(int j = 0; j<l; ++j) nigga[i].push_back(j);
        for(int j = 0; j<r; ++j) possa[i].push_back(m-j-1);
    }

    for(int run = 0; run < k; ++run){
        vector<int> perm(n);
        for(int i = 0; i<n; ++i) perm[i] = i;
        sort(ALL(perm), [&nigga] (int x, int y){return nigga[x].size() > nigga[y].size();});
        for(int i = 0; i<n/2; ++i){
            int j = perm[i];
            answer[j][nigga[j].back()] = run;
            nigga[j].pop_back();
        }
        for(int i = n/2; i<n; ++i){
            int j = perm[i];
            answer[j][possa[j].back()] = run;
            possa[j].pop_back();
        }
    }


    allocate_tickets(answer);
 
    return ans;
}
 
 
// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
//     int n, m, k; cin >> n >> m >> k;
//     vector<vector<int>> a(n, vector<int>(m));
//     for(int i = 0; i<n; ++i) {
//         for(int j = 0 ;j<m; ++j) cin >> a[i][j];
//         sort(ALL(a[i]));
//     }
 
//     cout << find_maximum(k, a) << "\n";
 
 
//     return 0;
// }

• 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