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- #include <iostream>
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- int niza[n];
- int brojac=0;
- for(int i=0;i<n;i++)
- {
- cin>>niza[i];
- }
- for(int j=0;j<n;j++)
- {
- for(int i=0;i<n;i++)
- {
- if(niza[i]==1 && niza[i+1]==2)
- {
- brojac++;
- niza[i]=2;
- niza[i+1]=1;
- }
- }
- }
- cout<<brojac;
- return 0;
- }
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