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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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