Submission #974307

#	Time	Username	Problem	Language	Result	Execution time	Memory
974307		Pannda	Sequence (APIO23_sequence)	C++17	7 / 100	106 ms	33516 KiB

sequence

#include "sequence.h"

#include <bits/stdc++.h>
using namespace std;

int sequence(int n, vector<int> a) {
    vector<vector<int>> mp(n);
    for (int i = 0; i < n; i++) {
        a[i]--;
        mp[a[i]].push_back(i);
    }

    int ans = 0;
    for (int i = 0, c; i < n; i++) {
        if (i == 0 || a[i] != a[i - 1]) {
            c = 1;
        } else {
            c++;
        }
        ans = max(ans, c);
    }

    for (int med = 0; med < n; med++) {
        if (mp[med].size() < 2) continue;
        int l = mp[med].front();
        int r = mp[med].back() + 1;
        if (2 * (n - r + l + mp[med].size()) >= n) {
            ans = max(ans, (int)mp[med].size());
        }
    }

    return ans;
}

Compilation message (stderr)

sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:27:46: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   27 |         if (2 * (n - r + l + mp[med].size()) >= n) {
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

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