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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- int x;
- cin>>x;
- set<int> st;
- while(x--)
- {
- int a;
- cin>>a;
- st.insert(a);
- }
- if(st.size() == 1) cout<<"Yes\n";
- else cout<<"No\n";
- }
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