➤ Problem Link : 1154B. Make Them Equal
✅ C++ Solution :
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,flag,d,ans=-1,k;
cin>>n;
int arr[n];
for(int i=0;i<n;i++)
cin>>arr[i];
sort(arr,arr+n);
for(int i=arr[0];i<=arr[n-1];i++)
{
flag=1;
if(arr[0]>i)
d=arr[0]-i;
else
d=i-arr[0];
for(int j=1;j<n;j++)
{
if(i>arr[j])
k=i-arr[j];
else
k=arr[j]-i;
if(k!=d && k!=0)
{
flag=0;
break;
}
}
if(flag==1)
{
ans=d;
break;
}
}
cout<<ans;
}
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