Submission #167915

#	Time	Username	Problem	Language	Result	Execution time	Memory
167915		muhi1112	Pismo (COCI18_pismo)	C++17	30 / 70	36 ms	10616 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=100005;
const int INF=INT_MAX;

int n,dizi[N],maxst[N][21],tleft[N],tright[N],ans=INT_MAX;
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]);
		}
	}
}
int qmax(int l,int r){
	int j=log2(r-l+1);
	return max(maxst[l][j],maxst[r-(1<<j)+1][j]);
}
void prepro(){
	for(int i=0;i<=n;i++){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		if(!st1.empty()){
		    tleft[i]=st1.top()+1;
		}
		else tleft[i]=1;
		st1.push(i);
	}
	while(!st1.empty()){
		st1.pop();
	}
	//cout<<"sa"<<endl;
	for(int i=n+1;i>0;i--){
		while(!st1.empty() && dizi[i]<=dizi[st1.top()]){
			st1.pop();
		}
		if(!st1.empty()){
		    tright[i]=st1.top()-1;
		}
		else tright[i]=n;
		st1.push(i);
	}
	
}

int 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]):INT_MAX));
	}
	return ans;
}
int main(){
//	fri("in.txt");
//	fro("out.txt");
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
//	memset(dizi,-1,sizeof(dizi));
	for(int i=1;i<=n;i++){
		cin>>dizi[i];
		maxst[i][0]=dizi[i];
	}
	build();
	//cout<<qmax(2,2);
	prepro();
	//cout<<tleft[2]<<" "<<tright[2]<<endl;
	cout<<solve()<<endl;

return 0;
}

• Subtask 1: 30 / 70