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- #include<bits/stdc++.h>
- using namespace std;
- int gcd(int a,int b)
- {
- return __gcd(a,b);
- }
- int main()
- {
- int n,i,j,k,a,b,c,d,e;
- while(cin>>n)
- {
- if(n==0)
- break;
- vector<int>v;
- v.push_back(n);
- while(1)
- {
- cin>>a;
- if(a==0)
- break;
- v.push_back(a);
- }
- sort(v.begin(),v.end());
- c=0;
- for(i=1;i<v.size();i++)
- {
- a=v[i]-v[i-1];
- c=gcd(c,a);
- }
- d=c;
- if(c<0)
- d*=-1;
- cout<<d<<endl;
- }
- return 0;
- }
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