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# Author Problem Lang Verdict Time Memory Sent Judged  
214310316 Practice:
frank66884
1744F - 21 C++17 (GCC 7-32) Accepted 265 ms 1576 KB 2023-07-18 10:39:53 2023-07-18 10:39:53
→ Source
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll pos[200010],x,l,r,res;
int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		int n;
		cin>>n;
		for(ll i=1;i<=n;i++)
		{
			cin>>x;
			pos[x]=i;
		}
		l=r=pos[0];
		res=1;
		for(ll i=2;i<=n;i++)
		{
			int me=(i-1)/2;
			l = min(min(l, pos[me]), n + 1 -i);
            r = max({r, pos[me], i});
            res += max(0ll, i - (r - l));
		}
		cout<<res<<endl;
	}
	return 0;
}
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