제출 #167910

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
167910		muhi1112	Pismo (COCI18_pismo)	C++17	0 / 70	93 ms	65540 KiB

pismo

#include <bits/stdc++.h>
using namespace std;
 
#define endl '\n'
#define f1 first
#define s2 second
#define pb push_back
#define mp make_pair
#define ll long long
#define fri(a) freopen(a,"r",stdin);
#define fro(a) freopen(a,"w",stdout);
const int N=1000005;
const int INF=1e9+7;

int n,dizi[N],maxst[N][21],tleft[N],tright[N],ans=INF;
stack<int>st1;

void build(){
	for(int j=1;j<21;j++){
		for(int i=0;i+(1<<j)<N;i++){
			maxst[i][j]=max(maxst[i][j-1],maxst[i+(1<<(j-1))][j-1]);
		}
	}
	return;
}
int qmax(int l,int r){
	int j=log2(r-l+1);
	return max(maxst[l][j],maxst[r-(1<<j)+1][j]);
}
void prepro1(){
	for(int i=0;i<=n;i++){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		tleft[i]=st1.top()+1;
		st1.push(i);
	}
	while(!st1.empty()){
		st1.pop();
	}
	return;
	//cout<<endl;

}
void prepro2(){
	for(int i=n+1;i>0;i--){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		tright[i]=st1.top()-1;
		st1.push(i);
	}
	return;
}
ll solve(){
	for(int i=1;i<=n;i++){
		//cout<<tright[i]<<" "<<tleft[i]<<" "<<qmax(tright[i],tleft[i])<<endl;
		ans=min(ans,tright[i]-tleft[i]>0?qmax(tleft[i],tright[i])-dizi[i]:INF);
	}
	return ans;
}
int main(){
	//fri("in.txt");
	//fro("out.txt");
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>dizi[i];
		maxst[i][0]=dizi[i];
	}
	build();
	//cout<<qmax(2,2);
	prepro1();
	prepro2();
	//cout<<tleft[5]<<" "<<tright[5]<<endl;
	cout<<solve()<<endl;

return 0;
}

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