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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++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- ll a[200000],c,d=0,e,f,i,j,k,l=100000000000;
- cin>>c;
- for(i=0;i<c;i++)
- {
- cin>>a[i];
- if(a[i]==1) d++;
- }
- if(d)
- {
- cout<<c-d<<endl;
- return 0;
- }
- for(i=0;i<c;i++)
- {
- f=a[i];
- for(j=i+1;j<c;j++)
- {
- f=__gcd(f,a[j]);
- if(f==1)
- {
- l=min(l,(j-i));
- }
- }
- }
- if(l==100000000000) cout<<-1<<endl;
- else cout<<l+(c-1)<<endl;
- return 0;
- }
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