Submission #728007

#	Time	Username	Problem	Language	Result	Execution time	Memory
728007		WonderfulWhale	Martian DNA (BOI18_dna)	C++17	100 / 100	46 ms	8128 KiB

dna

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

#define int int64_t
#define pb push_back
#define st first
#define nd second
#define pii pair<int, int>
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()

const int MAXN = 200009;

int cnt[MAXN];
int sum[MAXN];
int cur[MAXN];
int tab[MAXN];

int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n, k, r;
	cin >> n >> k >> r;
	for(int i=0;i<n;i++) {
		cin >> tab[i];
		sum[tab[i]]++;
	}
	for(int i=0;i<r;i++) {
		int a, b;
		cin >> a >> b;
		cnt[a] = b;
		if(sum[a]<b) {
			cout << "impossible\n";
			return 0;
		}
	}
	int R = -1;
	int bad_cnt = r;
	int ans = 1e9;
	for(int L=0;L<n;L++) {
		while(R+1<n && bad_cnt) {
			R++;
			cur[tab[R]]++;
			if(cur[tab[R]]==cnt[tab[R]]) {
				bad_cnt--;
			}
		}
		if(bad_cnt==0) {
			ans = min(ans, R-L+1);
		}
		cur[tab[L]]--;
		if(cur[tab[L]]==cnt[tab[L]]-1) {
			bad_cnt++;
		}
	}
	cout << ans << "\n";
}

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