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- #include <bits/stdc++.h>
- using namespace std;
- int n,a[1000000],p[1000000],kon1=0,kon2=0,kon3=0,kon4=0;
- int main()
- {
- cin>>n;
- for (int i=0; i<n; i++)
- {
- cin>>a[i];
- }
- if (a[0]==0)
- {
- for (int i=n; i>=0; i--)
- {
- if (a[i]==1) {kon1=i; break;}
- }
- }
- if (a[0]==1)
- {
- for (int i=n; i>=0; i--)
- {
- if (a[i]==0) {kon2=i-1; break;}
- }
- }
- if (a[n-1]==0)
- {
- for (int i=0; i<n; i++)
- {
- if (a[i]==1) {kon3=(n-1)-1; break;}
- }
- }
- if (a[n-1]==1)
- {
- for (int i=0; i<n; i++)
- {
- if (a[i]==0) {kon4=(n-1); break;}
- }
- }
- if (kon1>kon2 && kon1>kon3 && kon1>kon4) cout<<kon1;
- else if (kon2>kon1 && kon2>kon3 && kon2>kon4) cout<<kon2;
- else if (kon3>kon1 && kon3>kon2 && kon3>kon4) cout<<kon3;
- else cout<<kon4;
- }
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