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- #include <fstream>
- #include <vector>
- using namespace std;
- int main()
- {
- int n;
- ifstream f("secv011.in");
- f>>n;
- vector<int> frq(3*n+1);
- frq[n]=1;
- int ps=0;
- int64_t sol=0;
- for(int i=1;i<=n;++i)
- {
- bool x;f>>x;ps+=x;
- sol+=frq[2*i-3*ps+n]++;
- }
- ofstream g("secv011.out");
- g<<sol<<'\n';
- return 0;
- }
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