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#include <iostream> #include <vector> #include <cstring> #include <algorithm> #include <map> using namespace std; int main(){ long long n; cin>>n; int niza[n]; for(int i = 0; i < n; i++){ cin>>niza[i]; } long long sz = 0; long long answer = 0; long long prev_zero = -1; for(int i = 0; i < n; i++) { if(niza[i] == 0) { answer += (long long)(i - prev_zero) * (long long)(n - i); prev_zero = i; } } cout << answer << endl; return 0; } /* 5 4, 2, 0, 1, 3 **/
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