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C.cpp
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C.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios::sync_with_stdio(0);cin.tie(0)
long long ara[200005],cnt[200005];
int main()
{
fastio;
long long t,n,i,p;
cin>>t;
while(t--)
{
cin>>n;
map<long long,long long> mp;
for(i=1;i<=n;i++)
{
cin>>ara[i];
mp[ara[i]]++;
}
p=0;
for(i=n;i>=1;i--)
{
if(i==n)
cnt[i]=mp[n];
else
cnt[i]=cnt[i+1]+mp[i];
}
for(i=1;i<=n;i++)
{
if(ara[i]!=cnt[i])
{
p=1;
break;
}
}
if(p==0)
cout<<"YES\n";
else
cout<<"NO\n";
}
return 0;
}