Submission #643401

#	Time	Username	Problem	Language	Result	Execution time	Memory
643401		andecaandeci	Martian DNA (BOI18_dna)	C++17	100 / 100	28 ms	2772 KiB

dna

#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, k, r; cin >> n >> k >> r;
    vector<int>a(n + 1), req(n + 1), freq(n + 1);
    for(int i = 1; i <= n; i++) cin >> a[i];
    for(int i = 1; i <= r; i++){
        int x, y; cin >> x >> y;
        req[x] = y;
    }

    int ans = 1e9;
    int left = 1, right = 0;
    int ok = 0;

    while(left <= n && right <= n){
        while(right + 1 <= n && ok != r){
            freq[a[right + 1]]++;
            if(freq[a[right + 1]] == req[a[right + 1]]) ok++;
            right++;
        }

        if(ok != r) break;
        ans = min(ans, right - left + 1);
        freq[a[left]]--;
        if(freq[a[left]] < req[a[left]]) ok--;
        left++;
    }   

    if(ans == 1e9) cout << "impossible" << '\n';
    else cout << ans << '\n';

    return 0;
}

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