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#include <iostream> #include <algorithm> using namespace std; int n; long long dp[115]; int niza[115]; long long fc(int i){ if(i==n){ return 1; } if(dp[i]!=-1){ return dp[i]; } long long result=0; int zbir=0; for(int j=i; j<n; j++){ zbir+=niza[j]; if(zbir==1){ result+=fc(j+1); } } return dp[i] = result; } int main() { cin>>n; for(int i=0; i<n; i++){ cin>>niza[i]; } for(int i=0; i<n; i++){ dp[i]=-1; } cout<<fc(0) << endl; return 0; }
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