Submission #916635

#	Time	Username	Problem	Language	Result	Execution time	Memory
916635		penguin133	Martian DNA (BOI18_dna)	C++17	100 / 100	37 ms	6996 KiB

dna

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

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, m, k, A[200005], req[200005], cur[200005];

void solve(){
	cin >> n >> m >> k;
	for(int i = 1; i <= n; i++)cin >> A[i];
	int cnt = 0;
	for(int i = 1; i <= k; i++){
		int a, b; cin >> a >> b;
		req[a] = max(req[a], b);
	}
	int ans = 1e18, l = 1;
	for(int i = 0; i < m; i++)if(!req[i])cnt++;
	for(int i = 1; i <= n; i++){
		cur[A[i]]++;
		if(cur[A[i]] == req[A[i]])cnt++;
		while(cnt == m){
			ans = min(ans, i - l + 1);
			cur[A[l]]--;
			if(cur[A[l]] == req[A[l]] - 1)cnt--;
			l++;
		}
	}
	if(ans == 1e18)cout << "impossible";
	else cout << ans;
	cout << '\n';
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

dna.cpp:41:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   41 | main(){
      | ^~~~

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