Submission #1090135

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090135		andrei_iorgulescu	Martian DNA (BOI18_dna)	C++14	100 / 100	23 ms	4692 KiB

dna

#include <bits/stdc++.h>

using namespace std;

int n, k, r;
int a[200005];
int frmin[200005], fr[200005], cnt_bad;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> k >> r;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    for (int i = 1; i <= r; i++)
    {
        int x, y;
        cin >> x >> y;
        frmin[x] = y;
    }
    cnt_bad = r;
    int dr = 0;
    int ans = 1e9;
    for (int i = 1; i <= n; i++)
    {
        while (dr < n and cnt_bad != 0)
        {
            dr++;
            fr[a[dr]]++;
            if (fr[a[dr]] == frmin[a[dr]])
                cnt_bad--;
        }
        if (cnt_bad != 0)
            break;
        ans = min(ans, dr - i + 1);
        fr[a[i]]--;
        if (fr[a[i]] + 1 == frmin[a[i]])
            cnt_bad++;
    }
    if (ans == (int)1e9)
        cout << "impossible";
    else
        cout << ans;
    return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32