Submission #789467

#	Time	Username	Problem	Language	Result	Execution time	Memory
789467		Trisanu_Das	Martian DNA (BOI18_dna)	C++17	100 / 100	76 ms	4580 KiB

dna

#include <bits/stdc++.h>
using namespace std;
 
long long n, k, cnt, x, a[200010], b[200010], c[200010], l = 1, r, minn = 1e18;
 
int main() {
	cin >> n >> k >> cnt;
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= cnt; i++) {
		cin >> x;
		cin >> b[x];
	}
	while (r <= n) {
		if (cnt) {
			r++;
			c[a[r]]++;
			if (c[a[r]] == b[a[r]]) cnt--;
		} else {
			minn = min(minn,r-l+1);
			if (c[a[l]] == b[a[l]]) cnt++;
			c[a[l]]--;
			l++;
		}
	}
	if (minn == 1e18) cout << "impossible" << endl;
	else cout << minn << endl;
}

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