Submission #891102

#	Time	Username	Problem	Language	Result	Execution time	Memory
891102		Kiameimon_Welt_Rene	Martian DNA (BOI18_dna)	C++14	0 / 100	34 ms	8300 KiB

dna

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define elif else if
#define dbg(v)\
	cout << "line(" << __LINE__ << ") -> " << #v << " = " << (v) << endl;
	
signed main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	
	int n, k, R; cin >> n >> k >> R;
	int req[n], cnt[n], arr[n], sz = 0;
	unordered_set<int> nums;
	fill(req, req+n, 0); fill(cnt, cnt+n, 0);
	for(int i = 0; i < n; i++) cin >> arr[i];
	for(int i = 0; i < R; i++){
		int b, q; cin >> b >> q; sz += q;
		req[b] = q; nums.insert(b);
	}
	if(sz > n){cout << "impossible"; return 0;}
	int l = 0, r = 0, ans = LLONG_MAX; bool stop = false;
	while(l < n-sz){
		if(l == 0 && r == n) break;
		while(!nums.empty()){
			if(l == 0 && r == n) stop = true;
			int val = arr[r]; cnt[val]++;
			if(req[val] != 0 && cnt[val] >= req[val])nums.erase(val);
			if(!nums.empty()) r++;
		}
		if(stop) break;
		ans = min(ans, r-l+1);
		int val = arr[l]; cnt[val]--;
		if(req[val] != 0 && cnt[val] < req[val]) nums.insert(val);
		l++;
	}
	fill(cnt, cnt+n, 0);
	for(int i = n-sz+1; i < n; i++)	cnt[arr[i]]++;
	bool ok = true;
	for(int i = 0; i < n; i++){
		if(req[i] > cnt[i]) ok = false;
	}
	if(ok) ans = min(ans, sz);
	if(ans == LLONG_MAX){cout << "impossible"; return 0;}
	cout << ans;
	
	return 0;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32