cf982d Shark

ref

#include <algorithm>
#include <iostream>
#include <cstdio>
#include <map>
#include <set>
using namespace std;
typedef pair<int,int> par;
int n;
par a[100005];
set<par> se;
map<int,int> mp;
int main(){
	cin>>n;
	for(int i=1; i<=n; i++){
		scanf("%d", &a[i].first);
		a[i].second = i;
	}
	sort(a+1, a+1+n);
	se.insert(par(1, n));
	mp[n] = 1;
	int maxn=0, ans=-1;
	for(int i=n; i; i--){
		if(mp.size()==1 && mp.begin()->second>=maxn){
			maxn = mp.begin()->second;
			ans = a[i].first + 1;
		}
		set<par>::iterator it=se.upper_bound(par(a[i].second, 0x3f3f3f3f));
		it--;
		if(it->first<=a[i].second-1){
			par x(it->first, a[i].second-1);
			se.insert(x);
			mp[x.second-x.first+1]++;
		}
		if(a[i].second+1<=it->second){
			par x(a[i].second+1, it->second);
			se.insert(x);
			mp[x.second-x.first+1]++;
		}
		int len=it->second-it->first+1;
		se.erase(it);
		mp[len]--;
		if(!mp[len])	mp.erase(len);
	}
	cout<<ans<<endl;
	return 0;
}