Submission #446830

#	Time	Username	Problem	Language	Result	Execution time	Memory
446830		Nima_Naderi	Traffic (CEOI11_tra)	C++14	0 / 100	68 ms	10352 KiB

tra

//In the name of God
//#pragma GCC optimize("O2")
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
const ll MXN = 1e6 + 10;
const ll INF = 1e9;
ll n;
ll A[MXN], dp[MXN], pd[MXN];
int main(){
	ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
	cin >> n;
	for(int i = 1; i <= n; i ++) cin >> A[i];
	sort(A + 1, A + n + 1, greater<ll>());
	ll ans = 0;
	for(int i = 1; i <= n; i ++){
		ll rem = A[i];
		if(n - i + 1 < rem) continue;
		ans ++;
		i = i + rem - 1;
	}
	reverse(A + 1, A + n + 1);
	for(int i = 1; i <= n; i ++){
		if(A[i] > i){
			dp[i] = dp[i - 1];
			pd[i] = -INF;
			continue;
		}
		pd[i] = dp[i - A[i]] + 1;
		dp[i] = max(pd[i], dp[i - 1]);
	}
	cout << pd[n] << '\n';
	ans = min(ans, dp[n]);
	//cout << ans << '\n';
	return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 0 / 8
• Subtask 5: 0 / 8
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• Subtask 10: 0 / 9
• Subtask 11: 0 / 9
• Subtask 12: 0 / 9