Submission #505270

#	Time	Username	Problem	Language	Result	Execution time	Memory
505270		wiwiho	Martian DNA (BOI18_dna)	C++14	100 / 100	33 ms	4548 KiB

dna

#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, k, r;
    cin >> n >> k >> r;

    vector<int> a(n + 1);
    for(int i = 1; i <= n; i++) cin >> a[i];

    vector<int> need(k);
    vector<int> cnt(k);
    for(int i = 0; i < r; i++){
        int b, q;
        cin >> b >> q;
        need[b] = q;
    }

    int lp = 1;
    int ans = -1;
    int ok = r;
    for(int i = 1; i <= n; i++){
        cnt[a[i]]++;
        if(cnt[a[i]] == need[a[i]]) ok--;
        while(lp < i && ok == 0 && cnt[a[lp]] > need[a[lp]]){
            cnt[a[lp]]--;
            lp++;
        }
        if(ok != 0) continue;
        int len = i - lp + 1;
        if(ans == -1 || len < ans) ans = len;
    }

    if(ans == -1) 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