Submission #680502

#	Time	Username	Problem	Language	Result	Execution time	Memory
680502		jhwest2	Martian DNA (BOI18_dna)	C++17	100 / 100	237 ms	11748 KiB

dna

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

const int N = 202020;
int n, k, r, a[N];
map<int, int> mp;

int main() {
    cin.tie(0); ios_base::sync_with_stdio(0);
    cin >> n >> k >> r;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    for (int i = 0; i < r; i++) {
        int x, y; cin >> x >> y;
        mp[x] = y;
    }  
    int cnt = r, ans = 1e9;
    for (int i = 1, j = 1; i <= n; i++) {
        while (j <= n && cnt) {
            if (--mp[a[j]] == 0)
                --cnt;
            ++j;
        }
        if (cnt == 0)
            ans = min(ans, j - i);
        
        if (++mp[a[i]] == 1)
            ++cnt;
    }
    if (ans == 1e9)
        cout << "impossible";
    else
        cout << ans;
}

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