Submission #476410

#	Time	Username	Problem	Language	Result	Execution time	Memory
476410		AdamGS	Martian DNA (BOI18_dna)	C++14	100 / 100	38 ms	6736 KiB

dna

#include<bits/stdc++.h>
using namespace std;
typedef long double ld;
#define int long long
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=2e5+7;
int T[LIM], ile[LIM], R[LIM];
int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, k, r;
	cin >> n >> k >> r;
	rep(i, n) cin >> T[i];
	int zle=0;
	rep(i, r) {
		int b, q;
		cin >> b >> q;
		R[b]=q;
		if(q) ++zle;
	}
	int l=0, ans=LIM;
	rep(i, n) {
		while(l<n && zle) {
			++ile[T[l]];
			if(ile[T[l]]==R[T[l]]) --zle;
			++l;
		}
		if(!zle) ans=min(ans, l-i);
		if(ile[T[i]]==R[T[i]]) ++zle;
		--ile[T[i]];
	}
	if(ans==LIM) cout << "impossible\n";
	else cout << ans << '\n';
}

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