Submission #530341

#	Time	Username	Problem	Language	Result	Execution time	Memory
530341		fatemetmhr	Martian DNA (BOI18_dna)	C++17	100 / 100	35 ms	3824 KiB

dna

#include <bits/stdc++.h>

using namespace std;

const int maxn5 = 3e5 + 10;

int a[maxn5], req[maxn5];

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	
	int n, k, r;
	cin >> n >> k >> r;
	for(int i = 0; i < n; i++)
		cin >> a[i];
	for(int i = 0; i < r; i++){
		int a, b; cin >> a >> b;
		req[a] = b;
	}
	int id = 0;
	req[a[0]]--;
	int rem = r, ans = n + 10;
	if(req[a[0]] == 0)
		rem--;
	for(int i = 0; i < n; i++){
		while(rem && id < n - 1){
			id++;
			req[a[id]]--;
			if(req[a[id]] == 0)
				rem--;
		}
		if(rem == 0)
			ans = min(ans, id - i + 1);
		req[a[i]]++;
		if(req[a[i]] == 1)
			rem++;
		if(id == i){
			id++;
			req[a[id]]--;
			if(req[a[id]] == 0)
				rem--;
		}
	}
	if(ans > n)
		cout << "impossible" << endl;
	else
		cout << ans << endl;
}

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