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- #include <fstream>
- #include <iostream>
- using namespace std;
- ifstream f("progresie3.in");
- ofstream g("progresie3.out");
- long a,b,i,j,t,k=1,n=0,Max=0,y,z,c,p=1,ln=1,v[1001],m,r,x1,x2;
- float s=0,nr=0,x;
- int ok=1;
- int main()
- {
- while(f>>n)
- v[n]=1;
- i=1;
- while(i<=1000)
- {
- if(v[i]==1)
- {
- x1=i;
- break;
- }
- i++;
- }
- i=1;
- while(i<=1000)
- {
- if(v[i]==1 && i!=x1)
- {
- x2=i;
- break;
- }
- i++;
- }
- r=x2-x1;
- for(i=x1+1;i<=1000;i++)
- {
- if(v[i]==1 && i-x1!=r) ok=0;
- else if(v[i]==1 && i-x1==r) x1=i;
- }
- if(ok) g<<r;
- else g<<"NU";
- return 0;
- }
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