Submission #288475

#	Time	Username	Problem	Language	Result	Execution time	Memory
288475		Blagojce	Discharging (NOI20_discharging)	C++11	11 / 100	137 ms	17040 KiB

Discharging

#include <bits/stdc++.h> 
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>
 
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
 
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1000000007;
const ld eps = 1e-13;
const ld pi  = 3.14159265359;
 
mt19937 _rand(time(NULL));
clock_t timer = clock();
const int mxn = 2e5+5;
 
const ll A = 911382323;
const ll B = 972663749;

void solve(){
	int n;
	cin >> n;
	ll a[n];
	fr(i, 0, n){
		cin >> a[i];
	}
	stack<int> S;
	
	pq<pair<ll, int> > Q;
	
	bool active[n];
	memset(active, false, sizeof(active));
	ll dp[n+1];
	dp[n] = 0;
	for(int i = n-1; i >= 0; i --){
		while(!S.empty() && a[S.top()] <= a[i]){
			active[S.top()] = false;
			S.pop();
		}
		while(!Q.empty() && !active[Q.top().nd]){
			Q.pop();
		}
		
		dp[i] = a[i]*(n-i);
		if(!Q.empty()){
			dp[i] += -(int)Q.top().st;
		}
		Q.push({-dp[i], i});
		active[i] = true;
		S.push(i);
	}
	
	ll mx = 0;
	ll ans = inf;
	fr(i, 0, n){
		mx = max(mx, a[i]);
		ans = min(ans, dp[i+1]+mx*n); 
	}
	cout<<ans<<endl;
	
}


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tc = 1;
	//cin >> tc;
	while(tc--) solve();
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 25
• Subtask 4: 11 / 11
• Subtask 5: 0 / 14
• Subtask 6: 0 / 28