Submission #982017

#	Time	Username	Problem	Language	Result	Execution time	Memory
982017		vjudge1	Sequence (APIO23_sequence)	C++17	28 / 100	768 ms	2097152 KiB

sequence

#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_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_mset;

int sequence(int n, vector <int> a){

    vector <vector <int>> repe(n+1, vector<int>(n+1));

    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            repe[i][j] = repe[i][j-1] + (a[j-1] == i);
        }
    }

    int ans = 0;

    for(int i=0; i<n; i++){
        ordered_mset st;
        for(int j=i; j<n; j++){

            st.insert(a[j]);

            auto x = st.find_by_order((j-i)/2);
            auto y = st.find_by_order((j-i+1)/2);

            //cout<<i<<' '<<j<<' '<<*x<<' '<<*y<<endl;

            ans = max(ans, repe[*x][j+1]-repe[*x][i]);
            ans = max(ans, repe[*y][j+1]-repe[*y][i]);
        }
        st.clear();
    }

    return ans;

}

• Subtask 1: 11 / 11
• Subtask 2: 17 / 17
• Subtask 3: 0 / 7
• Subtask 4: 0 / 12
• Subtask 5: 0 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18