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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- ll a[300005];
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- test
- {
- ll c,d,e,f,i,j,k=-1,l=0;
- cin>>c;
- for(i=1;i<=c;i++)
- {
- cin>>a[i];
- l=max(l,a[i]);
- }
- for(i=1;i<=c;i++)
- {
- if(a[i]==l && i==1)
- {
- if(a[i+1]<l)
- {
- k=i;
- }
- }
- else if(a[i]==l && i==c)
- {
- if(a[i-1]<l)
- {
- k=i;
- }
- }
- else if(a[i]==l && (a[i-1]<l || a[i+1]<l))
- {
- k=i;
- break;
- }
- }
- cout<<k<<endl;
- }
- return 0;
- }
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