Submission #581266

#	Time	Username	Problem	Language	Result	Execution time	Memory
581266		MohamedFaresNebili	Carnival Tickets (IOI20_tickets)	C++14	11 / 100	43 ms	600 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
#include <ext/pb_ds/assoc_container.hpp>
 
        using namespace std;
        using namespace __gnu_pbds;
 
        using ll = long long;
        using pi = pair<ll, pair<ll, ll>>;
        using ii = pair<int, int>;
 
        #define pb push_back
        #define pp pop_back
        #define ff first
        #define ss second
 
        typedef tree<int, null_type, less<int>, rb_tree_tag,
            tree_order_statistics_node_update> indexed_set;
 
        ll find_maximum(int K, vector<vector<int>> A) {
            int N = A.size(), M = A[0].size(); ll res = 0;
            vector<vector<int>> S(N, vector<int> (M, -1));
 
            for(int R = 0; R < K; R++) {
                deque<pi> curr; vector<ll> arr;
                for(int l = 0; l < N; l++) {
                    int i = 0, j = M - 1;
                    while(S[l][i] != -1) i++;
                    while(S[l][j] != -1) j--;
                    curr.pb({A[l][i], {l, i}}),
                    curr.pb({A[l][j], {l, j}});
                }
                bool vis[N]; memset(vis, 0, sizeof vis);
                sort(curr.begin(), curr.end());
 
                while(arr.size() != N) {
                    while(vis[curr.front().ss.ff])
                        curr.pop_front();
                    while(vis[curr.back().ss.ff])
                        curr.pop_back();
 
                    ll U = curr.front().ff;
                    ll V = curr.back().ff;
 
                    if(arr.empty()) {
                        arr.pb(curr.back().ff);
                        vis[curr.back().ss.ff] = 1;
                        S[curr.back().ss.ff][curr.back().ss.ss] = R;
                        curr.pop_back();
                        continue;
                    }
                    sort(arr.begin(), arr.end());
                    ll md = arr[arr.size() - 1 / 2];
 
                    if(abs(U - md) >= abs(V - md)) {
                        arr.pb(curr.front().ff);
                        vis[curr.front().ss.ff] = 1;
                        S[curr.front().ss.ff][curr.front().ss.ss] = R;
                        curr.pop_front();
                    }
                    else {
                        arr.pb(curr.back().ff);
                        vis[curr.back().ss.ff] = 1;
                        S[curr.back().ss.ff][curr.back().ss.ss] = R;
                        curr.pop_back();
                    }
                }
                sort(arr.begin(), arr.end());
                for(auto U : arr)
                    res += abs(U - arr[N / 2]);
            }
            allocate_tickets(S);
            return res;
        }

Compilation message (stderr)

tickets.cpp: In function 'll find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:36:34: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |                 while(arr.size() != N) {
      |                       ~~~~~~~~~~~^~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10