سلسلة/cpp_gcc@rextester_bot

#include <bits/stdc++.h> using namespace std; int main (){ int n; cin>>n; int a[n]; for(int i=0; i<n; i++){ cin>>a[i]; } for(int i=0; i<n; i++){ if(fabs(a[i]-a[i+1])==fabs (a[i+1]-a[i+2])) cout<<"yes"<<endl; else cout<<"no"<<endl; } return 0; } /stdin 3 4 2 6

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