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#include <iostream> using namespace std; int main() { long long n; cin>>n; long long niza[n]; for(int i=1;i<=n;i++) { cin>>niza[i]; } niza[0]=0; niza[n+1]=0; long long dolzina; long long interval=0; for( long long i=0;i<=n;i++) { if(niza[i]==0) { long long j=i+1; while(niza[j]!=0) { j++; } dolzina=(j-i-1); interval+=(dolzina*(dolzina+1))/2; i=j-1; } } cout<<n*(n+1)/2 - interval; return 0; }
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