Submission #981966

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
981966	2024-05-13T17:23:18 Z	vjudge1	Sequence (APIO23_sequence)	C++17	Compilation error	0 ms	0 KB

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<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

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

    vector <vector <long long>> repe(n+1, vector<long long>(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);
        }
    }

    long long ans = 0;

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

            st.insert(a[j]);

            int x = st.order_of_key(j/2);
            int y = st.order_of_key((j+1)/2);

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

    return ans;

}

Compilation message

sequence.cpp: In function 'int sequence(int, std::vector<long long int>)':
sequence.cpp:29:17: warning: unused variable 'y' [-Wunused-variable]
   29 |             int y = st.order_of_key((j+1)/2);
      |                 ^
/usr/bin/ld: /tmp/ccNPxryL.o: in function `main':
grader.cpp:(.text.startup+0x2a4): undefined reference to `sequence(int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status